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Found 181 results

  1. Its about time!! i made the 3hr round trip to my scope shop (after a tough days work) but all well worth it, i could not wait till the weekend when i'd have plenty of time to go early and avoid rush hour traffic, be well rested and awake, that makes no sense at all lol. I was far too giddy to wait for the weekend, anyway she's here and she's beautiful!, i will no doubt be tossing that horrible 28mm eyepiece it comes with and replacing the finder scope with a spare telrad i have. Now i just need a clear night and a couple of hours for equilibrium and we'll see what this little gem can do! it sure feels and looks like a quality piece of gear i must say, that beautiful corrector just screams "i mean business".
  2. Hi all, Whenever i took pictures attached to my telescope i get a big white flare in the middle..am using celestron astromaster 130eq with nikon d3200...i hv attached a sample image..please tell me y this happens?
  3. The Great Barred Spiral Galaxy ( NGC 1365 ) in the constellation Fornax edit: new version with new long exposure data ( 52 x 240sec ) and better dark subtraction / dithering to remove streaks in the noise and amp glow. This also allowed for a greater stretch revealing more faint data in the galaxy and small faint fuzzies in the image .. The Great Barred Spiral Galaxy ( NGC 1365 ) in Fornax ( please click / tap to see larger ) and below I have added a 100% crop of new version: ........ original image: NGC 1365 ( please click / tap on image to see larger ) ............... The Great Barred Spiral Galaxy ( NGC 1365 ) in the Constellation Fornax Below the equator, not seen from much of the Northern hemisphere, NGC 1365 passes very nearly directly overhead an observer situated near Cape Town, as Sir John Herschel was in November of 1837, or near Sydney, as I was, almost exactly 180 years later, when I photographed this “remarkable nebula” that is numbered 2552 in his book of observations from the Cape. Not called a “nebula” now, of course, this striking object is one of the nearest and most studied examples of a barred spiral ( SB ) galaxy that also has an active galactic nuclei resulting in its designation as a Seyfert galaxy. At around 60 M light years from Earth, NGC 1365 is still seen to occupy a relatively large area ( 12 by 6 arc minutes ) due to its great size; at some 200,000 light years or so across, NGC 1365 is nearly twice as wide as the Milky Way and considerably wider than both the Sculptor and Andromeda galaxies. This High Dynamic Range ( HDR ) image is built up from multiple exposures ranging from 4 to 120 seconds with the aim of capturing the faint detail in the spiral arms of the galaxy whilst also retaining colour in the brightest star ( the orange-red 7th magnitude giant, HD 22425 ). Also, scattered throughout the image, and somewhat more difficult to see, are numerous and far more distant galaxies with apparent magnitudes of 16 to 18 or greater. Mike O'Day ................. Identification: The Great Barred Spiral Galaxy New General Catalogue - NGC 1365 General Catalogue - GC 731 John Herschel ( Cape of Good Hope ) # 2552 - Nov 28, 29 1837 Principal Galaxy Catlogue - PCG 13179 ESO 358-17 IRAS 03317-3618 RA (2000.0) 3h 33m 37.2 s DEC (2000.0) -36 deg 8' 36.5" 10th magnitude Seyfert-type galaxy in the Fornaux cluster of galaxies 200 Kly diameter 60 Mly distance .................. Capture Details: Telescope: Orion Optics CT12 Newtonian ( mirror 300mm, fl 1200mm, f4 ). Corrector: ASA 2" Coma Corrector Quattro 1.175x. Effective Focal Length / Aperture : 1400mm f4.7 Mount: Skywatcher EQ Guiding: TSOAG9 Off-Axis-Guider, Starlight Xpress Lodestar X2, PHD2 Camera: Nikon D7500 (unmodified) (sensor 23.5 x 15.7mm, 5568x3712 @ 4.196um pixels) Location: Blue Mountains, Australia Moderate light pollution ( pale green zone on darksitefinder.com map ) Capture ( 22 Nov 2017 ) 6 sets of sub-images with exposure duration for each set doubling ( 4s to 120s ) all at ISO400. 70 x 120s + 5 each @ 4s to 60s total around 2.5hrs Processing ( Pixinsight ) Calibration: master bias, master flat and no darks Integration in 6 sets HDR combination Image - Plate Solution ========================================== Resolution ........ 1.328 arcsec/px Rotation .......... -0.008 deg ( North is up ) Field of view ..... 58' 8.6" x 38' 47.5" Image center ...... RA: 03 33 41.182 Dec: -36 07 46.71 ==========================================
  4. Hi all, I have celestron astromaster 130eq scope ..it is very difficult to view through 20mm eyepiece..is there any other for broader view for both terestrial and astronomical viewing?with good eyerelief as I wear glasses..32mm is good ..please reply
  5. I ran into this abomination in a local random junk classified ad, seller does not say much other than its a telescope, i have no intentions of buying a scope that looks like it fell form the ugly tree and hit every branch on its way down lol. can anybody identify this scope which certainly only its mother can love?
  6. Spiral Galaxy NGC 6744 in Pavo NGC 6744 is a Milky Way like barred spiral galaxy in the constellation Pavo. Visible only from lower latitudes, the light we see now left this galaxy around 25 million years ago. NGC 6744 in Pavo ( please click / tap on image to see larger and sharper ) Capture Details: North is up. Telescope: Orion Optics CT12 Newtonian ( mirror 300mm, fl 1200mm, f4 ). Corrector: ASA 2" Coma Corrector Quattro 1.175x. Effective Focal Length / Aperture : 1400mm f4.7. Mount: Skywatcher EQ8. Guiding: TSOAG9 Off-Axis-Guider, Starlight Xpress Lodestar X2, PHD2 . Camera: Nikon D5300 (unmodified) (sensor 23.5 x 15.6mm, 6016x4016 3.9um pixels). Location: Blue Mountains, Australia Moderate light pollution ( pale green zone on darksitefinder.com map ). Capture ( 16, 17, 19 Sept. 2017 ). 9 sets of sub-images with exposure duration for each set doubling ( 1s to 240s ) all at ISO800. 85 x 240s + 5 each @ 1s to 120s. Processing ( Pixinsight - 5-17 Nov 2017 ). Calibration: master bias, master flat and no darks. Integration in 9 sets. HDR combination PhotometricColorCalibration Arcsinh stretch ( function written by Mark Shelley ) Image Plate Solver - NGC 6744 - Sept 17, 2017 =================================== Resolution ........ 0.586 arcsec/px ( full size image ) Rotation ............ 0.001 deg. Focal ................. 1372.24 mm. Pixel size ........ ..3.90 um. Field of view ..... 58' 30.3" x 38' 59.0". Image center ...... RA: 19 09 46.591 Dec: -63 51 13.44 ==================================
  7. For sale opticstar maksutov cassegrain F12.5. F 1900mm long focal length telescope, great condition throughout, except the attached dovetail bar which has the usual marks (see pics). Also comes with a decent finderscope and end caps and home made dew cap. Great visual scope. Selling due to upgrade and fund a larger scope. Price £220, collection only, unless someones prepaired to take the risk and pay extra for the delivery.
  8. Sir John Herschel at the Cape of Good Hope Having spent the years 1825 to 1833 cataloguing the double stars, nebulae and clusters of stars visible from Slough, in the south of England, John Herschel, together with his family and telescopes, set sail from Portsmouth on the 13th of November 1833 bound for Cape Town. As detailed below, in an extract from his book, the family enjoyed a pleasant and uneventful voyage and arrived some 5 months later at Table Bay with all family and instruments in good condition. Reading on however, one might very well think that it might not have ended so well had they but left shortly after ... “... (iii.) Accordingly, having- placed the instrument in question, as well as an equatorially mounted achromatic telescope of five inches aperture, and seven feet focal length, by Tulley, which had served me for the measurement of double stars in England; together with such other astronomical apparatus as I possessed, in a fitting condition for the work, and taken every precaution, by secure packing, to insure their safe arrival in an effective state, at their destination, they were conveyed (principally by water carriage) to London, and there shipped on board the Mount Stewart Elpliinstone, an East India Company's ship, Richardson,Esq. Commander, in which, having taken passage for myself and family for the Cape of Good Hope, we joined company at Portsmouth, and sailing thence on the13th November, 1833, arrived, by the blessing of Providence, safely in Table Bay, on the 15th January, 1834, and landed the next morning, after a pleasant voyage, diversified by few nautical incidents, and without seeing land in the interim. It was most fortunate that, availing himself of a very brief opportunity afforded by a favorable change of wind, our captain put to sea when he did, as we subsequently heard that, immediately after our leaving Portsmouth, and getting out to sea, an awful hurricane had occurred from the S. W. (of which we experienced nothing), followed by a series of south-west gales, which prevented any vessel sailing for six weeks. In effect, the first arrival from England, after our own, was that of the Claudine, on the 4th of April, with letters dated January 1st.(iv.) ...” “Result of Astronomical Observations, Made During the Years 1834, 5, 6, 7, 8, At the Cape of Good Hope ... “ by Sir John Herschel, 1847 John Herschel rented a property and set up the twenty foot reflector near Table Mountain, at a site, that was then, just outside of Cape Town. The Twenty Feet Reflector at Feldhausen, Cape of Good Hope, South Africa, 1834 This telescope was made by Herschel in England and transported, along with his other instruments, by ship to Cape Town and then inland to Feldhausen. The telescope is a Newtonian reflector, built to William Herschel’s design, with a focal length of 20 feet and clear aperture of 18 1/4 inches ( f13 ). The location of the telescope was established by careful survey to be: lat 33d 55’ 56.55”, long 22h 46’ 9.11” W ( or 18.462 deg E ). The site of the great telescope was memorialised by the people of Cape Town by the erection of a granite column that is still there today. ............. Observations of the Sculptor Galaxy Amongst his many thousands of observations made from Cape Town, of nebulae, clusters of stars, double stars, the sun, etc., Sir John Herschel records that he observed V.1 ( CH10 - Caroline’s Nebula - the Sculptor Galaxy ) during two different “sweeps” and gave it the number 2345 in his South African catalogue. Sweeps: 646 - 20th November 1835; 733 - 12th September 1836 At the latitude of Feldhausen, and on these dates, the Sculptor galaxy would have been at an altitude around 80 degrees above the northern horizon when near the meridian ( which was where the telescope was pointed during Herschel’s “sweeps” ). The sight afforded from this location, with the Sculptor Galaxy almost at the zenith, must have been significantly brighter and clearer than the Herschels had thus far been granted from its location way down near the horizon south of Slough. .......... Other Obsevations by John Herschel from Cape Town Also observed by John Herschel in 1835 were the people and animals that inhabit the moon ... The Great Moon Hoax of 1825 - “Lunar Animals and other Objects, Discovered by Sir John Herschel in his Observatory at the Cape of Good Hope ... “
  9. Over the years I have done a lot of Excel calculation to solve my astronomy problem when I try to make parts work together. Most of them has been my private and only in Swedish, some of them I have published on a Swedish forum and I believe some people have found them useful. Now I decided to translate them into English and put them on my homepage for downloading. It's always hard to understand Excel sheets that others have put together, but I hope that these ones with a little help of the instructions on my homepage could be interesting and useful to some of you. http://astrofriend.eu/astronomy/astronomy-calculations/astronomy-calculations.html Beware that it could be something wrong in the calculations, if I find something I try to correct it. I don't take any responsible of it, you use them at your own risk ! /Lars
  10. Hi, I am completely new to this but am wanting to do some stargazing and astrophotography. i have a great interest particularly in the deep sky and am wondering what kind of telescope i should get in order to mainly view the deep sky but also one that if i wanted to i could view planets etc. there are low levels of light pollution in my area and i have a pretty good budget (around 1k) wanting a quality telescope that i will still own in years to come as i am wanting to go on to study this. i am currently looking at reflectors but was wondering if anyone thought that i was looking at the wrong type of telescope based on my preferences. if anyone has any recommendations i would love to hear them as i am not yet sure about well trusted brands etc. also for the astrophotographers out there what do you believe is an essentials kit for a beginner. Thanks
  11. Hello guys, I may have found exactly the forum I need here I would be really glad if you could help me a bit please : I love stargazing on the mountain next to home (low light pollution), but now I want to level up. I mean, I'd like to use a device that is better than my eye to see the night sky. The problem is I am quite lost between telescopes, lenses, reflectors, refractors, and hybrids devices etc. So here I am, coming for your advice that will be, I am sure, of great help. Here's my question : what device is best suited for my use ? I'd like to see constellations and close deep sky like big galaxies (andromeda M31 for example). I am aware that refractor lenses are less bright than reflexion telescopes but I'm not certain which one to buy. > The main purpose would be a looking through device, but ideally if I can plug my Canon DSLR it would be fantastic. What are best brands for an amateur ? I prefer to pay more but once than cheap but twice and have a budget of around 250-300 € (if one is a bit above but really effective I can go a higher). Thank you a lot in advance for your time and advice ! Golfox2
  12. Observations of the Sculptor Galaxy ( NGC 253 ) by William and John Herschel ......... Part 2. Observations of "Caroline's Galaxy" by Sir John Herschel, 1830's Sir John Herschel, the only child of Mary Baldwin and Sir William Herschel, was born in 1792 when his father was in middle age and already famous as one of world's leading astronomers. Having excelled in school, and no doubt inspired by his famous elders, John Herschel decided upon a career as a 'man of science' and set out to pursue a wide range of interests; with one particular focus being a continuation of the study of the heavens commenced by his father and aunt, Caroline Herschel. In 1820, with the assistance of his father, John Herschel supervised the construction of a new telescope at Slough in England. As described in the extract below ( from a paper presented to the Royal Society in 1826, titled "Account of some observations made with a 20-feet reflecting telescope ... " ), the telescope had a polished metal mirror with clear aperture of 18 inches, focal length of 20 feet and was modelled on the same design created by his father. It is this telescope, in the 1820’s and early 30’s, following the death of his father and the return of his aunt Caroline to Hanover, that John Herschel used to 'sweep' the night sky and extend the catalogue of nebulae and clusters of stars that was published by his father ( see W. Herschel's Catalogue of One Thousand new Nebulae and Clusters of Stars ). On the 1st of July 1833, having complied sufficient observations, John Herschel presented to the Royal Society an updated list of the positions and descriptions of the Nebulae and Clusters of Stars that he had thus far observed. As noted in the introduction to the paper published in the Philosophical Transactions, he had planned to wait before publishing until he had complied a fully comprehensive general catalogue of objects visible from the south of England. However, due to his expectation of “several more more years additional work” needed to complete the task and his assessment that he now was in a position to address, at least in part, the then current “... want of an extensive list of nebulae arranged in order of right ascension ...”, he elected to present his list, “ ... simply stating the individual results of such observations as I have hitherto made ... “. It was not until October 16, 1863, some thirty years later, that Sir John would deliver to the Royal Society his General Catalogue of Nebulae and Clusters of Stars. As well as introducing many objects that had not previously been recorded, Sir John’s list of 1833 included a re-examination of, and in some cases a small correction to, the positions of many of the deep sky objects observed by his father and noted down by his aunt. One of these re-visited objects was, unsurprisingly, the large and bright nebula discovered by Caroline Herschel in 1783 and recorded in Sir Williams’s catalogue as V.1 / CH 10 ( object number one, of class five ( very large nebulae ) / Caroline Herschel #10 ). In total, John Herschel records around 2500 observations of nebulae and clusters of stars in his 1833 paper; with observation #61 being V.1, the “ Sculptor Galaxy “ . The measured position of V.1is given in RA and the angle from the north celestial pole ( all reduced to epoch 1830.0 ). The description can be interpreted by reference to the legend in the paper. Thus, “ A vL mE vB neb “ becomes “ A very large, much extended, elliptic or elongated, very bright nebula “. He also notes that in addition to this observation, #61, noted down from sweep #306, V.1 was also observed in sweep #292, “but no place was taken”. The figure to which he refers , figure 52, is included towards the back of his paper and is a sketch he made of the Sculptor Galaxy. to be continued ...
  13. Hey everyone ! I am new to this site , don't know how to properly use it , but hope someone will help me As the topic says , I am trying to buy my first telescope , and am quite excited for it. I have been reading wuite a lot about astronomy , so I know most of the basics , but have many many unanswered questions ... xD I was originally looking for a scope for viewing the planets , but well , after learning more , I thought that maybe a scope that can show only planets will eventually get a BIT boring , and will not be used much (although I still admire the planets and still will want to observe them). Just a quick info on me : I live in a city , have no place to go / or car to transport my scope to a darker place , live in a building , hope to observe from the rooftop. My ONLY CONCERN about this is that from my balcony I can see Vega at night , and as depressing as it may sound , nothing more .It may be because there are buildings covering my view (I at least hope so that's the case) or light pollution , although the place I live is in the orange to red zone in many light pollution maps. So originally I stumbled upon the Orion Starseeker IV 80mm GoTo refractor. http://www.telescope.com/Telescopes/GoTo-Computerized-Telescopes/Orion-StarSeeker-IV-80mm-GoTo-Refractor-Telescope/c/1/sc/15/p/113919.uts Thought it was good for the GoTo and stuff , but after doing some research , got concerned about the sturdyness of the mount.Some said it was too shaky (I have almost constant winds of about 10mph at night here) . Plus after some while I discovered DeepSpace and got even more interested in it than the planets . So I started to seek for reflectors. After a while I discarded Dobsonians as an option , cause I do want to do astrophotography ( just amateur , not gonna spend money on expensive DSLR s or sth) . And maybe in the future I will want to do some more serious astrophotography , so it will be very sad , if I have to change the scope later , if I want to... So after doing some research I am currently watching these scopes . 1. Orion 9827 AstroView 6 Equatorial Reflector Telescope . https://www.amazon.com/dp/B0000XMSR0/ref=psdc_499154_t1_B01N2HJBQC 2. SkyWatcher Explorer-150P EQ3-2 Reflector. https://www.firstlightoptics.com/reflectors/skywatcher-explorer-150p-eq3-2.html The only downside of these is that they're not GoTo (The second one has an option , but it's out of my price range) , but I think an additional RA motor drive will do the thing. At lease if I will be able to find anything in my sky ... That's it ! If you own/have used any of these scopes tell me more about them ! What you like/dont like etc. ANY GENERAL ADVICE IS APPERCIATED . Thanks !
  14. So i was browsing amazon de and i found a telescope thats incredibly cheap.A meade 8 inch goto.It retails for 2000 euros but its selling FOR FREAKING 350 EUROS.Somebody is really trolling or the telescope is completely broken although it says its like new.I can give the link if you want to see it.Imagine if the telescope is in great condition and if the seller is trusted.I would kill myself.
  15. Hi Everyone, I'm completely new to this forum and to star gazing. I am struggling with a decision on my first scope. I definitely want to do planetary viewing however i think very soon i will want to start looking at DSO's. I'm also extremely keen on astrophotography and believe i'd need an EQ mount with tracking. I really want to have great views of planets and do not want to see just a tiny blob of light through the scope (seeing permitting) I am looking at the following but please feel free to recommend any others that I may be missing: Skywatcher Skymax 127 Skywatcher Explorer 200p One of my big queries between these two is what affect will the f5.6 to f11 make and will there have to be more adjusting with the explorer. Many thanks for your help.
  16. Hi to all you members on SGL. I am a novice with 3 months experience with a SW200P dob, having started initially with a pair of Oregon 15 x 70 Bins on a tripod mount. I have referenced some good books and spent some time with Stellarium and I am encouraged by my new learnt ability to navigate the night sky with the 200p. I have connected my Nikon D600 (24mp full frame) DSLR to the scope and produced some satisfying photos of the moon, however I am interested in imaging some DSO's. ( I have caught the bug with no cure in sight!) I intend to get a tracking mount such as a SW HEQ5 Pro Synscan, but for now would like to purchase a wide field refractor and produce some wide field imaging with a basic mount, I understand that subs of around 30 sec can be produced with mediocre results initially until I get a better mount. Also it would be nice to have a grab and go scope which is more convenient than the big DOB. Also this would give me some images to experiment with the software such as DSS and Registax 6. So, I have been researching three achromatic telescopes, The Skywatcher ST80 and ST102 (both come with kit mounts ranging from AZ3 to EQ1 and the Bresser Messier AR-102/600 (which looks stylish and has the Hex focus) However, despite spending somewhere in the region of 4-5 hours so far researching for reviews on the BM102, nothing has been forthcoming>? I am aware of the issues of CA with these small tube Achromats, however the plan is to Purchase one of the three now, save for the HEQ5 mount, then at a later stage use the scope purchased now as a guide scope and but a better APO doublet or triplet scope for the main tube. So, having laid the table so to speak, which of the three would you advice and why please, I have been told by two companies stocking the BM102/600 that mechanically it is far superior to the two Skywatchers, but I am concerned that I cannot find ANY reviews on this OTA for its optical quality ?. I am aware that Synta make a few of these 80 and 100mm scopes for different suppliers but I am let to believe that the BM is a separate manufacturer. Any advice or better still hearing from someone who owns the Bresser Messier AR-102/600 would be amazing, so thank you for reading this long post and thank you in advance of your reply. Regards Graham Side note:- I have a VERY heavy duty pan tilt Manfrotto tripod which I previously used to support my Sinar 5x4 Large format bellows camera so its very steady and has a pan tilt head already fitted, I intend to mount the new scope on this as an AZ to begin with.
  17. Hello guys as you see i am new in the forums and im starting my stargazing adventure.I want to use my telescope as an astronomical and a terrestrial telescope so preferably a mak or a refractor.My budget is 450 dollars for both telescope and tripod. I already found one good telescope http://skywatcher.com/product/bk-1206az3/ Its the skywatcher 120/600. Let me know if you have any other telescopes.Thank you
  18. Hello All! Currently, I have a Meade ETX 90 telescope. I really like it and get great views of the moon and planets out of it. However, I am hoping to upgrade to a large reflector. I am looking at various scopes ranging from the Orion SkyQuest XT8 to the forbiddingly pricey Orion SkyQuest XT12i Intelliscope. I know that aperture is one of the most important things to consider in a telescope, but I also realize that people can get "aperture fever" and go for scopes that are unnecessarily large. I am wondering; Is a bigger aperture worth the price jump from 8'' to 10'' or from 10'' to 12''? How much more will I be able to see? I have heard that the best telescope for a person is dependent on the kinds of things they want to observe. I don't really look at deep sky objects (though I am getting increasingly interested in them), and mostly enjoy the moon, planets, and a few double stars. I want a telescope that will accommodate this, but is also able to have a great grasp on deep sky objects. Honestly I think I am on the right track with the scopes I am looking at, but I really want some advice on which size is best for me. What do you think? Thanks for the advice!
  19. Hi, After a lot of research I purchased my first advanced telescope a 12inch Orion SkyQuest Open Truss Dobsonian. Being into astronomy for years now this is the first gaint telescope I am using. Today was first light and I was rather confused as to what I was seeing. Comparing my tiny 4inch view of Jupiter with the view from this 12inch; it was nearly similar! So the question is which eyepieces should I use to get better detail? I have a 28mm, 32mm, 15mm, 6mm etc. and a Baader zooming hyperion. I viewed Jupiter from both the telescopes using a 32mm wide angle eyepiece. This is probably a really rookie question so go soft on me Which eyepieces and of which make should I attach to fully utilize the capability of this telescope? I tried the Baader and the 15mm and the 32mm for seeing Jupiter tonight. Any help would be highly HIGHLY appreciated. Clear Skies, Div
  20. ( Edit 20 Aug: adjusted to increase brightness ) ... The Fighting Dragons of Ara ( NGC 6188 ) ( please click/tap on image to see larger and sharper ) ...................... Original: The Fighting Dragons of Ara ( NGC 6188 ) ( please click/tap on image to see larger and sharper ) Bright Nebula NGC 6188 and open cluster NGC 6193 are embedded 4,300 light years away in the Sagittarius arm of our Milky Way galaxy and can be seen with the naked eye south of Scorpius in the constellation of Ara. With powerful stellar winds and energetic ultra-violet radiation, massive stars sculpt the interstellar gas and dust of the nebula into wonderful shapes and cause the interstellar gas to brightly fluoresce. Closer to the hot young stars of the cluster, bright blue “sunlight” reflects off the clouds of gas and dust to produce the blue reflection nebulae seenin the image. Magnitude +5.19, RA 16h 41m 42s, Dec -48deg 48' 46". Approx. 3800 light years away. Image details: Plate Solution: Resolution .......0.586 arcsec/px ( original full size image ). Rotation .......... 89.764 deg. Pixel size ........ 3.90 um. Field of view ..... 58' 41.6" x 39' 9.5". Image center ...... RA: 16 40 09.856 Dec: -48 41 22.50. Image bounds:. top-left ....... RA: 16 42 10.059 Dec: -49 10 30.54. top-right ...... RA: 16 42 06.489 Dec: -48 11 57.14. bottom-left .... RA: 16 38 11.010 Dec: -49 10 39.74. bottom-right ... RA: 16 38 11.897 Dec: -48 12 05.58. Telescope: Orion Optics CT12 Newtonian ( mirror 300mm, fl 1200mm, f4 ). Corrector: ASA 2" Coma Corrector Quattro 1.175x. Effective Focal Length / Aperture : 1410mm f4.7. Mount: Skywatcher AZ Eq6 GT. Guiding: TSOAG9 Off-Axis-Guider, Starlight Xpress Lodestar X2, PHD2 . Camera: Nikon D5300 (unmodified) (sensor 23.5 x 15.6mm, 6016x4016 3.9um pixels). Location: Blue Mountains, Australia Moderate light pollution ( pale green zone on darksitefinder.com map ). Capture ( 24 June 2017 ). 12 sets of sub-images with exposure duration for each set doubling ( 1/8s to 240s ) all at ISO800. 34 x 240s + 10 each @ 1/8s to 120s. Processing ( Pixinsight - 19 Aug 2017 ). Calibration: master bias, master flat and no darks. Integration in 12 sets. HDR combination PhotometricColorCalibration.
  21. Hello, Recently, one of my friends has moved out of the country and he has handed me (and other friends) certain items he couldn't take with him or didn't want to sell. Considering that I was the biggest star lover of the bunch , having learnt a few constellations -mostly to figure out where north is while hiking, I've been handed down his old telescope. I have researched a bit about it these past 3 days I've had it, and I would like to ask a few questions if you would be so kind to answer. So, first things first, what I've figured out (or have been told) so far: 1) It is on an equatorial mount (I'm 90% sure). 2) It is QUITE old (more than 15 years old). 3) I have 2 Barlow lenses (or mounts?): one 1.5X and one 3X, and 2 eyepieces: one 25mm and one 4mm, the latter I believe to be a Huygenian (Huygensian? Huyngensoid?) type since it has a very tiny top lens. 4) Any packaging and/or documentation is long fossilized in an unknown attic somewhere in south-eastern Europe. Rather than waste your time with other suppositions I've made that may or may not be true, I will tell you what it says on the actual telescope: 1) The mark is BSA Optics. 2) It's made in China. 3) On a label on the side, it says "AT375X112", and beneath "375X112mm". The questions I have are as follows: 1) What could I expect to see with the current equipment? Planets? Comets? Nebulae? Is it possible to see Andromeda? I tried using it for yesterday's peak of the Perseids, but it wasn't of much use (or I didn't know how to use it); 2) What documentation would you suggest? I don't have a lot of expandable income, but if there's two things I never scrimp on, it's books and drinks with friends. Also, as far as star charts/maps go, what should I get? I would like, if possible, something that can be used at different latitudes. 3) Are there any pieces of equipment that wouldn't set me back too far, something that would be worth it for improving my experience? Thank you for your help. P.S. Sorry for any English errors, it's not my first language.
  22. I'm brand new to this site, but I'm having an issue with my Celestron Powerseeker 127eq telescope. It's brand new right out of the box today. I have another telescope, Zhummel Z10, but the celestron just won't focus. It gets so close to focusing and just needs a little more. Any my help is appreciated thank!
  23. Pressure Tuning review Hello everyone, I figured I would write down my thoughts on my Lunt LS60 pressure tune retrofit, bear with me though, I am a solar baby and cannot talk the talk as deeply as you seasoned observers. On May 17 of this year I shipped off my Lunt for a pressure tune retrofit, it was originally a tilt tuner, I was always wondering why it had a tuner at all considering the views were great, I was able to see both prominences and disc detail like filaments and so on simultaneously which was great. But the tilt tuner left me feeling like I was missing out after reading about what tuning really meant, by that I mean no matter how much I turned that little wheel back and forth absolutely nothing changed no matter how good seeing was or how steady I kept my gaze, and my eyes are good. Both Lunt and my local telescope shop whom I trust very much upon inspection assured me that it will not be a visible change, the wheel they say was to snap the etalon into band and not so much to tune through different features, on or off band and that was what it's function was I was told. Ok I was ok with that, the views were great so I didn't let it chew away at me, but a small part of me was convinced that my tuning wheel was not working properly, it turned with such ease that a stiff breath would spin it, it just didn't have any resistance at all and it bugged me a bit. I decided to take the hit and ship it off for a retrofit to pressure tuning, the cost would be $500 US plus shipping back and forth, which in Canadian turned out to be $850 all said and done, i purchased the scope for such a great price that I figured why not I'd still be ahead anyway. Off it went, I was nervous knowing pimple faced teen aged warehouse kids would be hurling my scope into and out of trucks, but it arrived safely and the wait was on, Lunt customer service was commendable to say the least, they assured the retrofit would be an improvement and so helpful and informative throughout the whole process. Exactly two months later I received my scope, which was about 3 weeks longer than the time I was quoted but that's ok, the eclipse is around the corner here in north america and Lunt is busier than ever. I must mention that there was an issue with the feather touch focusser when it arrived, it was rough and felt like it had received a hard knock, I contacted Lunt and they offered to send me a standard focusser until after the eclipse because they had no feather touch in stock. I didn't blame them for the focusser, but they were concerned and offered to take action before interrogating me and diverting blame to the shipper and that is a commendable thing, it turns out that after some investigation by me I realized that it was my fault, I recall shipping the scope on its side within the case which left the focuser knob contacting the lid of the case , I remember having to press the lid down a bit too hard. After speaking to starlight, the focuser manufacturer, they said they've seen that before, a knock will misalign the focuser and it clearly was knocked during shipping I managed to fix the focuser after all, now let's hear about the pressure tuning already right! First thing that struck me was the size of the tuning cylinder, it is larger and adds more weight than I imagined, this is great for a good grip on the cylinder (which you'll need!!) I'll get to that later, but it did throw the balance of the scope on my Grand Polaris mount way off, so much so that I was unable to move the clamshell forward enough on the bracket to offset the added weight, if my bracket was another 2 inches longer it would be ok, something I have to consider. One very important factor when switching to pressure tuning is the mount, I'm using a rock solid Vixen GP, oldie but goodie, it's solid as a mountain and smooth as silk, but I'm afraid that anything less would have made for a hard time. Pressure tuning is nowhere near as effortless as turning that little wheel, i can guarantee that if you are planning on mounting one on anything less than a very sturdy mount you may be frustrated, the effort required to turn the wheel is far greater than the force required to turn any focuser. You definitely don't want the sun to look like a dot on an oscilloscope while you're trying to find your tuning preference. I figure I'll describe what pressure tuning is from a mechanical point of view, it is as simple as a cylinder with a piston inside that forces air into a chamber inside the scope. As you thread the cylinder in it pushes air into the chamber surrounding the etalon which in turn physically affects the etalon. I have been enjoying the pressure tuner a lot lately and made sure to give it a fair chance under good seeing conditions, so far it has been a pleasure to use comparing with tilt tuning. It was explained to me that tilt tuning (this is from Lunt) is to snap the etalon into band and not for tuning back and forth during a session, I was sold it was on or off band and that's about it. The pressure tuner right away showed off its superiority, i am now able to finely tune back and forth revealing different features in full detail rather than a happy mid point for all features which is where I was at with tilt tuning. Some people i understand leave their tuning point in one place and don't touch it which is fine, but I greatly enjoyed finely turning that cylinder through its travel, ever so slightly and watching different features reveal themselves in fine detail. Being a noob in solar astronomy I cannot yet get into the hard core jibber jabber behind every features characteristics, I don't yet know if I'm seeing dilithium Crystals emitted from the flux ionic resonations within cavitation nodules but I'll get there lol. One thing I can speak of though is when I turn that cylinder I can actually see its effects whereas before I was unable to exact any meaningful change on the suns disc. One thing I was very curious about was if there would be any banding where certain sections of the disc were in tune while other parts were not, my tilt tuned model had an annoying issue where the best view was to the far right and as the disc moved detail would drop off near center. I understand this is common and can be different in every scope, I am happy to say that the disc pretty evenly detailed across its face, I've carefully watched as I moved the disc side to side looking for bad spots and with the exception of the outer edge I cannot see any detail drop off. I'm glad because Lunt says they can do their best to remedy that but cannot guarantee it won't have banding. I hope this little write up can help others who may be contemplating the same retrofit, one has to ask whether a pricey retrofit is worth the cost, I myself think it was definitely worth it, aside from the advantages of pressure tuning itself I'm sure it's resale value improved a fair bit. I did notice that Lunt did change the serial number sticker on my scope. The serial number changed from 2009920 to 0001392 which kind of gives it a whole new identity I guess, kind of like if Ford restored your car to new condition and even changed the VIN number lol. In conclusion i would advise anyone to pack their cope carefully and make sure your scope is sitting on its belly and not sideways like i did unfortunately, and please do yourself a huge favour and insist on a signature required return from lunt. My scope was left on my front doorstep, big box sitting there just screaming to be taken, i almost lost my mind! and insist than lunt ad a bit more foam around the sides between your scopes metal case and the shipping box not just foam end caps and 2 inches of empty space all around the sides of the box, this is something that kind of upset me, lucky it was ok though. Anyway, if anyone out there has any questions I'll be glad to answer them if I can, thank you for your patience regarding my lack of in depth knowledge.
  24. Hello everyone! I'm new here. So my question or questions may sound kinda ignorant. The answers may be a little obvious. I love this site and have read so many comments and learned so much! Anyway, I have a Canon 60D camera with live-view. I have a Tasco reflector with D=114mm F=900mm(this maybe a little small?). I will be using a T-ring/adapter and with this I hope to capture many decent photos. But for the eclipse, do need a special filter for the scope or the camera or both? If so, could you give suggestions where to get this? Thanks to everyone for any help!
  25. Hello all! I am a total noob and I have an eyepiece and a Barlow lens question: I have the Gskyer AZ70700 Refractor Telescope that I bought from amazon for my father and we have been using it for a week. It came with the 10 and 25mm eyepieces and a 3x Barlow lens. My father's old "BRESSER TRAVEL 20-60X60 SPOTTING SCOPE" that our cat destroyed had a zooming option that my father loved so after some research, I've also ordered the "Celestron 8-24mm Zoom Eyepiece (1.25")" from amazon and I hope it will work well with the telescope when it arrives in a week. I also assumed it would be a better quality eyepiece than the eyepieces that came with the telescope. Now my question is: Do you think a 5mm eyepiece would work well with my telescope? If so, what is the best 5mm eyepiece that I can buy below $30. Another question I have is that the 3x Barlow Lens that I have is making the view blurry and not clear like when I don't use the Barlow lens. Do you think a 2x Barlow lens would be better for our telescope? If so, what is the best 2x Barlow lens that I can buy below $30. I saw 2 Barlow lenses that were made by SVBONY and Solomark that are around $16 but I don't know if they are the right ones for our telescope and I wouldn't know which one to buy. I assume maybe I won't need to buy the 5mm eyepiece for better viewing if the 2x Barlow lense will work with my 10mm eyepiece or with the Celestron 8-24mm Zoom Eyepiece. What do you guys think? I would really appreciate any answers.
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