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Showing content with the highest reputation on 16/02/21 in all areas

  1. A warmer night here at -27c, maybe the vortex will move along soon. One thing is for sure- it does bring very good skies with it. The TSA120 was enlisted along with the 42mm LVW, 17/14mm Nikon HW and the 10mm Delos. Orion was hiding behind some pines so this one will be observed in a bit where there is a gap between them. Nice to see Leo again so the first target was the Triplet. The 42mm found them no issue, 2 brighter and the edge on fainter. In with the 14mm- thats it some nice cores appeared in 2 of them and the edge on glowed brighter. Very nice to see them again. Off to M51, ag
    14 points
  2. Work has been pretty hectic lately, and with the weather as it is there have been limited opportunities to observe. Tonight, I was not expecting the clear skies that treated me as I stepped out to put the bunnies to bed, and the crescent Moon looked lovely low in the West. Thinking that I would miss the chance, I then remembered my Unitron AltAz mount and the trusty Telementor. This was all pretty quick to setup, although I had to mess around a little to reach focus with the Leica Zoom, finally screwing it directly to the prism via the T2 thread to shorten the light path enough. Away
    10 points
  3. Hi all, I gave a presentation to Basingstoke AS last week on Sketching the Deep Sky. They have kindly let me put it on youtube - link below. It describes why I enjoy deep sky sketching (in this day of digital imaging) and my approach, equipment (inc a homemade sketch board) and drawing technique. It concludes with a trip through the Andromeda Galaxy from the binocular view, star clouds and spiral arms and to its brightest globular cluster.
    9 points
  4. Here I set out to see how much IFN (Integrated flux nebulas) I could capture with the RASA in a few hours. The area around M81 and M82 are by now well known for its prominent IFN, although it is still a very faint form of nebulosity. I actually captured more than looked good as it seemed to drown the nice galaxies in there. So ihere are two versions as I had difficultes deciding how much IFN to show. None of them show all the IFN signal that is in the data, that looked just too overwhelming. This is what Widipedia writes about IFN: Integrated flux nebulas are a relatively recently
    9 points
  5. Another day, another new toy, cheap Svbony guide scope. When this arrived my wife's said 'Is that you're new telescope?'. Had to explain that this is a telescope to go on top of my new telescope. She didn't even bother to ask any more questions
    9 points
  6. On Valentine's Day my partner excitedly presented me with a certificate proclaiming that a star in the sky had my name assigned to it. As a non astronomer she thought that she had done something really special for me, and hoped that I could locate it and take an image of it. I have no doubt that this topic will have been discussed at length on SGL in the past. Whether or not it is a scam is not the point I wish to make in this post. Stars have official names and/or numbers, and to unofficially assign someone's name to one is just a bit of fun and a nice gesture. What really got to me
    8 points
  7. Arrived today! Very nice quality - matches my scope perfectly
    8 points
  8. This has been my first image in a fair few months due to lack of clear skies, taken towards the end of January. NGC2403 is about 8 million light years away in the constellation Camelopardalis, with an apparent size of 19.9 x 10.1 arcmin. If you look closely you can spot a number of smaller galaxies across the image. I hadn't originally planned on imaging this, bit since the moon was up that night I decided to stay as far away from the moon as possible and chose this. Integration: 1 hour each of R, G, & B (in 60s subs). Scope: SkyWatcher ED80 DS-Pro, 0.85x reducer
    8 points
  9. Hi all, sorry for the delay in posting. had problems with my laptop and Autostakker3 kept on crashing and kept on getting strange stacking issues after that. Here's the results. Lunt 60mm DS and Zwo Asi 178mm for HA and 80ed with Baader K-Line filter and Hershal Wedge for Baader-K-Line. Processed with Autostakker3, ImPPG and false colour added in PS CS2.
    7 points
  10. I just witnessed the delivery of an 80mm Evostars at the local astroshop.
    6 points
  11. No. Yes, all of the things will have impact. First place is pixel size. 10x aperture scope will collect 10x light from same FOV. But how will all that light be divided into chunks? Smaller number of chunks means higher value per chunk. If pixels are the same - then yes - 10x aperture scope will have 10x light fall on each pixel. Next comes QE. Say first camera has 60% QE while second has 80% QE - that is 1/4 increase in QE - not insignificant. Given that all parameters are equal - then yes, 10x aperture will have x10 higher signal than x aperture scope for same expo
    6 points
  12. Post man dropped off a new power supply after the last one went up in a puff of smoke (due to a short circuit)
    6 points
  13. Yes, it is because you own an astronomical telescope. If you do what I did, and buy a solar telescope, the weather will change so that it is cloudy all day as well as at night.
    6 points
  14. Finally making some progress with the new cameras. Still waiting on a M74-M68 ring from FLO for the FF on the SS94, but was able to get everything balanced and couple of subs this evening. I made a 3D printed bracket for mounting the QHY9 and lens on a vixen dovetail bar.
    5 points
  15. Mainly in the observatory doing CCD photometry, but couldn’t resist getting the Tak FS 60Q on the ScopeTech + Berlebach Report out for a quick look around. So I grabbed and went
    5 points
  16. A little something for the Tecnosky 125/975 F7.8 due next week.
    5 points
  17. We also have separate bank accounts but my card gets used even when it’s not with me. It seems to go for days out all on its own. Clever technology
    5 points
  18. I thought I had posted to this topic some time ago but it seems I hadn't. These two scopes have been imaging in tandem since last spring. The smaller refractor is actually mounted on the underside of the rings of the larger one. That keeps the centre of gravity of the setup very close to the DEC head of the mount improving stability and reducing differential flexure of separate rings and dovetails. This setup gives me up to 10 mins of unguided images (for the larger refractor at 1300mm) by using APCC Pro. And doing the night shift: Roberto
    5 points
  19. Thought I'd go for a slightly different perspective on this. It's usually pictured "side on" with the prominent gas "tail" either going left or right. Tipped on it's side for this image this image, its going up.
    4 points
  20. A camera to make sure your other camera is calibrated. Thats a genius excuse for owning two cameras. Myself and Lorna have separate bank accounts. Not planning on changing that when we are married.
    4 points
  21. Didn't try lol! To try this properly I need the smallest TFOV possible with a 40mm eyepiece. Some day I'll try making a small "field stop" at the end of a tight 40mm (that I dont have). One of the reasons big dobs work is their ability to have a narrow TFOV with vg large apparent field eyepieces IMHO. Alnitak destroys IC434 with very wide field, eventhough I have seen it like this. The TSA120's inherent lack of scatter makes this much easier and some day I'll try straight through. What grabbed my attention last night was the Flame... this was the very best refractor view I've h
    4 points
  22. I don't know if this would be considered as cheating on another level, but here I go:) Since I also have an interest in weather satellites and radio astronomy I regularly receive weather images from Russian, European, Chinese and American weather satellites. Some time ago I became aware of a European satellite imaging the sun in extreme ultraviolet and dumping the images when in range of Belgium (location of headquarters). This is all done at a frequency of 2235MHz and can be received with moderate equipment. Here is my first image received from the Proba 2 satellite The noise i
    4 points
  23. Thank you:)) I enjoy it very much! I'm apart of a community of radio enthusiasts who receive all sorts of satellites in wide variety of frequencies. A couple months ago we started exploring the possibility of receiving Proba 1 & 2(which is the one I received here). Since then software has been developed to demodulate and decode the signal to get images from them. A lot of this hobby is built upon amateurs across the world and reverse engineering signal modulation because of poor documentation. I also regularly receive weather images and do hydrogen line observing with my own s
    4 points
  24. This should speed things up a little, and its not affected by clouds
    4 points
  25. The descriptions fast and slow refer to the focal ratio of the telescope, which we can find by: focal ratio = focal length / aperture These days we might say that f5 or lower is fast and f8 or higher is slow, so your maksutov is definitely slow. This is good news for you as it means most eyepieces will be "well corrected" when used with your telescope. A good example of this is your 18mm Starguider. In your telescope, a star will be a nice point of light in both the middle of the field of view and at the edge of the field, whereas used with my f6 telescope a star is a nice point of l
    4 points
  26. shooting in daylight fairly low. IR850 Celestron 114. QHY462C. Secondary shadow still looks offset after re collimating. Havent figured out why yet. Mirror clips were too tight. But now are set correctly.
    3 points
  27. My 'new' (to me) camera arrived today and I am very pleased indeed! It looks to be in mint condition and was a bargain at £750 with a dew heater and next day delivery thrown in thanks to a very kind seller. Running at 27% the TEC sat at -10 degrees with ambient of around 5 so it is very capable of cooling My guiding was only around 0.8 arc-seconds which is way above the 0.53" I think I need with the 1600. Even with that (and the clouds) I am bowled over by the performance. I am using unity gain (139) and an offset of 15 to get me started - if anyone has any thoughts on this pl
    3 points
  28. I know the feeling. Herself is under the delusion that I'm a millionaire.
    3 points
  29. Sounds familiar! To be fair, I've had something delivered almost every day for the past week, I think a ''small telescope to put on top of main telescope'' was the final straw! Especially as I had a ''2nd camera to make sure the first camera is pointing in the right direction'' delivered yesterday
    3 points
  30. Ok, I now performed simpler test and results are the same - wrong. I think that I also found a bug in WinRoddier. Simulation is as before - except - I did not make difference in defocus - both in and out focus are exactly at 22 P-V waves. I also did not add astigmatism term - but simply left things at 1/4 PV Primary spherical. Just as check - I generated same thing in Aberrator 3.0 - 80mm f/6 with 0.25 PV spherical and generated wavefront and MTF. Here is comparison between my wavefront and MTF and that of Aberrator: (color scheme is a bit different - I used "physics"
    3 points
  31. I have just heard from FLO that my AZ100 and accessories are on their way to me. Therefore I would like to submit a formal request to join this honourable club.
    3 points
  32. The attached gives the current state of play.Martin-Delgado_2020_Eur._J._Phys._41_063003.pdf Regards Andrew
    3 points
  33. This is how I do it with large mirrors. Hogging out is done with this 'machine' the rest is done with my MoM. It took me about 1.5 hours hogging out this 20" f/5.6 mirror using a angle grinder with a diamond disk. The surface is rather bumpy and to remove these irregularities it took me a 2 hours(or so) using a MOM(mirror-O-matic) and carbo #120. It is not futuristic looking I know, but this device saves me lots of work. When I need another ROC, I make me another set of curved side panels(using a router), that's all there is to.
    3 points
  34. Here is another fantastical galactic association captured by Hubble. This one is right out of Jules Verne!
    3 points
  35. OP is going to view the sky from a park in South London, if he goes away from the scope for a while, and the 'scope is still there when he comes back, that would be a magical thing by itself !
    3 points
  36. Welcome to SGL! What you claim is not true. Our price changed back when this discussion was started. It has not moved even £1 today. Oh Malcolm! Consider how many UK astronomy retailers have closed their doors over the years. Telescope House (now owned by Bresser-Germany), Telescope Planet, Venturescope, Scopes'n'Skies, Pulsar Optical, Astronomy & Nature Centre, Astronomia, F1telescopes, Greenwich, David Hinds... Together with others I have probably forgotten. Were they all profiteering too? With stock as scarce as it is we will still be dispatching customer backo
    3 points
  37. Reused box from TS TS 71mm field corrected apo
    3 points
  38. ES 30 82mm... I have one, but I think if buying again it would be the XW30 or 30mmUFF. Just sayin'
    3 points
  39. I have to agree with Sunshine that a 6" dob can give you a whole lot of lovely things to look at! Last night I found the Clownface Nebula (aka Eskimo Nebula) and Crab Nebula, loads of open clusters, found the Leo Trio for the first time, took another peek at the Andromeda Galaxy and enjoyed the colourful "winter Albireo" and Almach double stars. All with 6" dob, after about 1 month or less of practice. If I can do it, you can too. Have fun!
    3 points
  40. Hello Craig F and welcome to the forum. You will have plenty of questions, ask away there are some very knowledgeable people on here. Can I suggest that you do not buy anything for the telescope until you have it in your hands, instead buy yourself Turn left at Orion, a very good and informative book. This book provides a wealth of basic information into the telescope and types of eyepieces and Barlow lenses that you can get for your telescope. As you get into the hobby, the book also provides some very good targets for you to find. I also like and use a planisphere, plus get yourself a n
    3 points
  41. Hustled outside in a biting wind last night to take advantage in a break in the clouds. I was after a quick colour starfield to blend with my Hα Angelfish from last year. Just had time to grab a 30 second exposure with the Samyang 135mm f2 before the cloud rolled across. I then blended in some Hα data taken with the Samyang and a 50mm lens using Photoshop. The Angelfish (Sh2-264) nebula is also known as the Lambda Orionis or Meissa ring, thought to be a supernova remnant. To see why you need to look at it in IR. This image makes use of data products from the Wide-fie
    2 points
  42. Good solid bit of kit this, had one briefly before realising it was overkill on the StellaMira 80mm, but perfect for your new refractor
    2 points
  43. Both methods are the same. If you end up with same number of pixels in you green channel as sensor size would suggest (like if you have 6000x4000 px sensor and you end up with 6000x4000 green channel) - you did not loose the data - you "added" the data. Missing green values have been interpolated from green component of bayer matrix. For photometry purposes - that is just fine as interpolation should preserve average pixel values (in simplest form, missing values are added by linear interpolation which is just average of two neighboring existing values - so average of the lot do
    2 points
  44. Or get an AZ5 which can hold up to 5kgs on a skywatcher aluminium tripod ( 9kgs on a steel tripod ) .. its half the price of the Skytee 2 . The skytee is an exeptional AZ mount that can hold masses of weight but , for portability the AZ5 is perfect
    2 points
  45. First completed image for the season, and the first completed image with the ZWO ASI 071MC Pro! Taken from our backyard with the SpaceCat, using the Optolong L-Enhance filter. No calibration files besides bias (flats would be a good idea, but I don't have a good way to take them yet). Roughly 7 hours of integration time over 2 nights, 15min subs. Processed in PixInsight with finishing touches in Photoshop. Struggled again quite a bit with the background, which I suppose is not really uniform in the area anyway. Despite the L-Enhance being a multi bandpass filter, I couldn't really ge
    2 points
  46. Ha if you could have seen me last night, Chris my wife said as we were going to bed "oh look the sky has cleared and I can see the stars, whooosh I was into my thermals hat and boots and unlocking the conservatory doors, my scope was carried out on to the patio and yes a star, lined up towards the West, down on one knee to get focus, too late cloud cover, never mind there is another smattering of stars to the East, swing the scope round, down on one and oppps clouded over again. This went on for about 40 mins before it dawned on me that most experienced sky watchers wouldn't even have unl
    2 points
  47. 2 points
  48. Youre not going to see much difference between the 21E and the 20 APM IMHO, edge astig being one difference, and yeah I have them both. If I drop the 20 APM I'll cry, if I drop the 21E I'll jump up and down ,cry and throw a fit over the money I just lost
    2 points
  49. A very poor image of Orion, only got a few light frames as most of them were out of focus when the focus ring moved slightly as its quite loose, so will tape it down next time. 1600 iso 50mm prime lens at 1 min x 5 lights, 2.8f. As I've said before in other posts when my star adventurer arrives I'll be able to get much better results. Clouds were skudding along the bottom at the time as well.
    2 points
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