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Showing content with the highest reputation on 14/12/19 in all areas

  1. This is R, G, B, Ha, OIII and SII all taken with a ZWO-ASI1600MM-Pro fitted to a Canon 200mm f2.8 lens. The R, G and B were all 10s and 30s combined in Photoshop. The NB was all 30s, 60s and 120s, again layered in Photoshop. This is essentially RGB combined with HOS, pre-processed in APP, post-processed in PI and combined in PS. Thanks for looking. Adrian
    16 points
  2. Last weekend got a clear night and decided to take first light with ZWO ASI533MC Pro. The Moon was quite near to full, but still was giving around 1h 30 minutes darkness - good chance to make some tests of the ZWO Duo-Band Filter too. Additional performed test was the usage under the skies of APT's support for the ZWO native driver As target picked-up an object that is well known with idea that can show the performance of the camera itself. BTW I have never imaged the Rosette so far, and it is still in my list for a narrowband attempt The first revision is comparison of single frames
    8 points
  3. Hi guys Still no chance of getting any imaging done, so what better to do than revisit old data! I thought I'd go back and re-do M31, as it is my longest data set (by quite some distance) for a true colour target. I usually only end up with a couple of hrs to work with, but on this occasion I was able to get 7 hrs worth, all on a single night with no moon about. Plus, I was never truly happy with how the original came out, but I kept putting off a re-process as I remember finding M31 an absolute beast to process at the time! 24 x 300s with an IDAS-D1 (ISO 200) 51 x 360s wit
    6 points
  4. These are my last images of 2019 taken with my ED72 and 183mm pro to be replaced by a 533pro These targets are not easy due to location trees etc except M1 , there was a bright moon as well so are all lucky shots but at last i have taken them warts and all . My guiding was all off as well Anyway a merry Christmas to you all and a Happy new year
    6 points
  5. My mid 1990s FL102 / 920s. Examples of this scope on certified optical benches have shown a Strehl Ratio of 0.988. From personal use its objective is practically flawless for visual observation. Aesthetically gorgeous visual presentation with outstanding colour correction and contrast. I changed the original 6x30 viewfinder for a more practical RACI and changed the original focuser to a more solid and stable Moonlite:
    6 points
  6. Wednesday Oct 30th. 58N, Achnahaird, NW Highlands, Scotland. Canon 6D MkII, Samyang 14mm. VSDC editor. Music - Storm Horizon by Lee Rosevere. Best in darkened room with the volume up...
    5 points
  7. my M31, taken with a vintage 135mm lens. I'm not sure whats causing the stars on the right to be so red - lens or filter probably Canon 1100D Ha mod Pentacon 135mm at F/4 StarAdventurer mount 20 X 180s Iso800 + 52 X 180s iso 1600 Astronomik CLS filter APP/ Photoshop
    5 points
  8. Great to hear you have got to the bottom of this @Piero. Seems a shame you've had to go to these lengths, though. I wonder how many people without your perseverance and expertise might have been left with a sub-optimally performing instrument. I fear I would have been one
    5 points
  9. A while ago, I decided to spend some time in re-design the mirror cell supports of this telescope, in order to fix the issues of astigmatism and spherical aberration once for all. I have tested this new design on a few sessions in the field, with very positive results. The telescope delivered very crisp and details views of the moon up to 300x (limit caused by the seeing, really). Stars were puntiform and uniform. A lot of small faint stars were visible. Off-axis views have improved massively too. In addition, the telescope behaviour has become consistent between sessions and within the same s
    5 points
  10. Hi Everyone I have posted a couple of iterations of this work in progress, a Ha only version and a HaRGB. I had an early Christmas present of a 2" Baader 8nm Oiii filter which I managed to try for a little over an hour between the almost non stop wind and rain. Of course once I had the data, albeit nowhere near enough, I had to have a go at my first bi-colour. Captured with 500d, 150pds, PHD, BYEOS, HEQ5 9 x 600s Oiii 29 x 600s Ha 6 x 900s Ha Flats for each and Bias , no darks as dithered in BYEOS Processed in photoshop and PI LE, using a bi-colour HOO
    5 points
  11. Plans are drawn. Only need a thumbs up from the rest of the household and we're pretty much ready to go
    5 points
  12. The otehr structures....not the ones most commonly seen. I ethought it fitting to depict some of the less well known and more seldomly images (on their own) portions of this amazing nebula. I have come to realize that the FSQ 106 with the .6x reducer (F3) and its 318mm focal length with the small pixels of the ASI 1600 is a perfect high resolutoion survey scope--very useful in taking widefield shots and then identifying smaller portions within the FOV that can be made into full stand alon images for later capture with a longer focal length system. There is good news and bad associated with
    4 points
  13. Hi all, This is 6 hours (30 x 12 min), taken with my modded Nikon D7000 @iso200 and Astronomik 12 nm Ha 2" filter on Meade LX200-ACF with reducer (=1600 mm FL @ F8). Guided with NexGuide on HEQ5 Pro. The plan was to do a Ha O3 bicolour on this target, but the O3 may be a future thing due to weather conditions. I usually remove the stars during part of my processing workflow and put them back later on, but this time I think the nebulosity and dust came out best without them. I did however try to find out which stars belong to Melotte 15 and include only those, just to portrait the M
    4 points
  14. Cheers. Here 5 hours of Ha for this nebula. While quite satisfied by the nebulosity is a pain for me about the stars. The corners are showing all the weak part of the setup. Looking for advice if someone is using a similar setup. ASI1600mm, baader Ha 7nm, light of 300" and 600" (different sky conditions in different nights). Lens Nikon 80-200 f2,8 closed to f5,6. Process all in Pixinsight. Thanks for your help
    4 points
  15. Not used it yet, John. Yes it is a bit like a perch. Just as long as I don't fall off it. Or even get nailed to it
    4 points
  16. Berlebach Charon observer's chair:
    4 points
  17. The trick it seems is to forget DPD are coming. They turned up yesterday with a 1Kg tub of optical pitch I had forgotten I had coming. They delights of old age! Regards Andrew PS now what was I going to do with it.
    4 points
  18. Looking through my notes, I see that I have been clouded out for the last 3 weeks, & only had two clear nights in the preceding month! So when the skies cleared on Monday afternoon I couldn't get the 200p out fast enough, especially as it would be my first chance this year to observe in Orion, albeit with a fullish Moon. Rigel is not a tight double ( 9.4") but I had read that the brightness difference ( over 6 magnitudes ), makes it difficult in an amateur scope. But inspired by a heads-up from @orion25 which suggests it as a good , but much easier, practice target for those hop
    3 points
  19. Good terminator detail yesterday just before midnight. Langrenus, Vendenilus, Petavius and Furnerius right on the terminator. Took the single frame image below to record the lunation at 23.39. Taken using SW80ED, Olympus E-M5 mk11, 1/640 second, 400 asa. Alas it clouded up and started to snow just afterwards so I didn't have time to get my binoviewer in use. I hope some of you did manage to get an eyeball on it, the detail I could see on the focusing screen looked very good. The close up is a crop of the same photo.
    3 points
  20. Could not resist another play with the Towa. I rarely do full moons so this was a new one on me. Stack (R6) of 40 from 80 subs at 200 asa 1/500s ish I think. Through the 1970s 80mm F15 Towa achro with the Olympus OM D EM1 mk1.5 mirrorless. Messed about with in PS. This time Ive left it in colour and used Hasta La Vista Green to get rid of greenachro fringes on high albedo features
    3 points
  21. Very interesting read Piero. I agree with Jeremy that you have shown great determination to sort out these issues in a systematic way. Is it possible to feed some of what you have learned during this excercise back to the maker of the scope so that they might consider some revisions to the primary cell design and execution ? Many other owners, I suspect, would not have got to the bottom of these problems and might have either lived with mediocre performance or moved the scope on.
    3 points
  22. My counterweights go on a magnetic knife strip attached to the lower part of the tube of my 12 inch dob. The 2 weights are 750g and 1500g respectively. With my heaviest eyepieces (wich weight 1.3kg) and the scope at a relatively low angle I need both of them. I have two positions on the strip that I can place them so that provides more weight variation. This is a DIY solution as I expect you have guessed ! In this pic the lighter of the two weights is in the upper position on the strip:
    3 points
  23. I thought I would share the discovery of this dwarf nova as nice example of international amateur cooperation On 2019-11-30 Simone Leonini , a member of the amateur Italian Supernova Search Project, http://italiansupernovae.org/ discovered a supernova candidate at mag 16.5 close to the galaxy UGC11775 in Cygnus. This was posted on the IAU Transient Name Server, the official site used by both amateurs and professionals for posting possible supernova discoveries. https://wis-tns.weizmann.ac.il/object/2019vww I monitor TNS as I can potentially confirm supernovae spectroscopically pr
    3 points
  24. I never got to post these last time I was here, but now I am back...….. These were taken in 2016 with the only change being a Canon 60D. I have been away for some time, but thought I would post now I am back. Hope all is well
    3 points
  25. That looks great - I just need to sell my house...and my kids, and then I'm ready!
    3 points
  26. From earlier in the month, an HaRGB compilation acquired using my Esprit 100/Atik 460/Avalon fast reverse combo... 20 x 300s RG, 20 x 450s blue, 40 x 300s Ha, preprocessed and registered in Astroart, colour composited and final processing in PaintShop Pro. More details here if you are interested.
    2 points
  27. Thanks guys for your comments. Yes, I spent a lot of time trying to figure out the source of the problems and this effort has been quite frustrating at some point. Whilst I think that every telescope is not perfect and can require some adjustment, it should still be functional. Unfortunately, this was not the case for this telescope. There are other things that could have been implemented in a different way, more in line with most of the other designs. For instance, the truss pole attachments, the plate holding both the focuser and the finder, the wood plane making the primary mirror cel
    2 points
  28. You mirror cell is looking more and more like my Astrosystems I only related to Piero what I knew worked and why- the Astrosystems cell has many nuances that can be overlooked but careful examination reveals a well thought out cell that works in the real world. Piero, Kudos to you for figuring out the mirror sag!
    2 points
  29. This might be of use to you EQ mount tutorial
    2 points
  30. When I was looking for a top class refractor back in 2016 a Vixen Fluorite 102 was top of my shortlist. Didn't find one then but the last UK example of the 1st run Tak FC-100DL's was available so I decided to go for that. Both use Canon Optron objectives at F/9 so very much equal in terms of performance I would think
    2 points
  31. Agreed, I think your feedback would be very useful and would hopefully lead to some design changes. Kudos to you for working through all the problems and getting them sorted.
    2 points
  32. This made me smile but I do think your own, @John and @Stu tasty Taks could easily take on the same title
    2 points
  33. As per @John’s post the theoretical maximum isn’t always useful. You’ll often find that you can see more at slightly lower powers as the view is sharper and has more contrast. Best analogy I can give is when you look at a photo on screen, let’s say of a bird. The bird is a little small but very clear and you can see a lot of detail so you decide to zoom in. But zooming in makes the bird a bit fuzzy. Sure it’s bigger but the definition is lost as is the detail. One of the first lessons of astronomy is that often less is more
    2 points
  34. Have commenced adding the external formers to the mould. These are ply/styrofoam/ply, and will be glassed over.
    2 points
  35. Since we are on the subject I thought I'd share a "live" video from my heavily modified [secondhand] CR150HD, 150mm f/8 H-alpha+ PST stage 3 refractor. Having no useful comparisons my own PST etalon may be good, average or poor. This is what I typically see on my 25" computer monitor during video capture. [BUT MUCH BIGGER!] The thermal agitation from the earth's atmosphere is very evident. It varies widely from hour to hour and day to day. I never saw much through my secondhand PST because the original ITF was opaque. It was soon replaced with a matching Maier ITF but by then Mr Peter Dr
    2 points
  36. I have a truss dob but since your lower OTA is solid it might be relatively close overall. My 500p came with 4.5kg (3x 1.5kg discs). Too little, so I added another 1.5kg which seems about spot on. It changes slightly depending on eyepiece/barlow etc but mostly on how much dew or frost accumulates on the fabric shroud - it gets quite heavy if saturated and adds a lot of weight. One time I left my counterweights at home and used a tie down strap to secure a small tool bag to the underside. That's one of the best alignments I've had! I thought if I tried that again and got it spot on,
    2 points
  37. Ok, not quite an advert to put in the classifieds, but this is listed in Arizona for sale, called an astronomer's paradise with a 36" goto dobsonian included in the sale. Basically, plot of land with an RV on it and scope etc included. Only $400k!! I'm going to have a word at home....! http://www.darkskyobserving.com/Paradise.html
    2 points
  38. The 80-200 f2.8 is one of the sharpest zooms ever made. Modern lenses can't come close. However, it wasn't meant for astro and many Nikon lenses suffer from coma - it's not a design priority. The diffraction spikes are due to the 9 bladed diaphragm. You are better off making a manual stop for the front of the lens so you can use it wide open.
    2 points
  39. Very nice. I really like seeing the output from the different filters, so thanks for sharing.
    2 points
  40. Great inspiration for DSLR users. Nice work.
    2 points
  41. This image pales in comparison to Steve's. its amazing how you don't even know something is amiss until you see the real deal...then its as clear as day. That is the most mysterious aspect of this hobby for me. perhaps ignorance is indeed bliss after all. This is a crop at normal scale of a larger image that depicts the entire Soul Nebula. np101is STT8300 about 20 hours total Ha, OIII and SII
    2 points
  42. This image shows the result of my imaging sessions in the Eifel, Germany during my holidays last year. When I was there we had 2 very clear nights and 2 nights with some high clouds. I decided to go for a dark nebula as these are impossible to image from where I live. This image shows the Shark Nebula (LDN1235) in the constellation of Cepheus. This is a nice cloud of gas and dust which is highlighted by the light of nearby stars. Telescope: TMB92 @ f/5.5 Camera: QSI583ws Mount: Skywatcher EQ6 Exposures: L: 53 x 600s R: 9 x 600s G: 9 x 600s B: 9 x 600s Total 13,3
    2 points
  43. I have every sympathy with people getting what we perceive as bad delivery drivers, I have had them too from Amazon logistics and the dreaded Yodel, but it is not laziness I would say, but the horrendous long hours and the pressure some of them have to put up with. Never mind the poor pay and support and things beyond their control slowing them down, like traffic. They often do not get paid an hourly rate it seems, but paid by the number of deliveries, which they have to complete, to get paid a half decent wage. I try, ( often fail, I admit, ) to try to consider their predicament, to be patien
    2 points
  44. Caught in passing car headlights- first light for dob upgrades. This was second outing last night after having had to go home and hairdryer the primary which was soaked in dew along with everything else. Didn’t realise how handy having a door in the tube actually is till then! Turns out a remote focuser is a really useful and enjoyable luxury! More than I’d imagined
    2 points
  45. After few weeks running and some good weather I have some updates on that. Here you find the last picture taken with the mount and the RC10, ASI1600MM-C, Astrodon filters and Riccardi. (close to 27kg at 1500mm) all data of this capture at Flickr and Astrobin https://www.astrobin.com/slwz3t/ https://flic.kr/p/2hmHkMQ I could confirm that the mount runs well, the phd2 graphics are very good with long good guiding time, for sure, no frames are excluded because the guiding. Currently I started a dual column setup on the observatory with the idea to move the
    2 points
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