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etunar

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Everything posted by etunar

  1. Thanks for sharing your data Datalord. Not having worked with proper mono stacks before I thought I'd have a go. - Used the base stacks and stretched in photoshop. - Created starless copies of both ha and O3 using starnet - further minor stretch on the starless copies. - combined the starless copies into HAOO. - used the copy of Ha that was stretched at the beginning as a luminiosity layer and blended with the colour image. It was interesting to work with - that blue quickly disappears under red despite looking bright in mono images. Very clean data to work with!
  2. Haha. I can relate to that. I love my combo of 6D, 135mm and star adventurer combo. It's a perfect travel setup i think with no laptops etc.. This is also one of the reasons why I'm more hesistant about buying an OSC - while it will definitely be an improvement over 6D, I am chuffed with what I can get from dark sky locations with it.
  3. oh definitely. I dont like doing short subs at all. too many files to manage as well. How come you have gone back to a 6D after asi1600 if you don't mind me asking?
  4. I thought about CCD, but I was a bit intimidated by very long exposure times (20-30min) people tend to use for subs.
  5. I do get that if you have the same sensor in mono vs osc, mono will be more efficient/faster. What makes my decision difficult is how does a 4-5 year old sensor from asi1600 compare with the newer technology sensor from asi2600 with higher QE, larger well depth, 16 bit etc.. cost wise the initial outlay is roughly the same between the two (I'm ignoring astrodon/chroma filters for the time being).
  6. indeed. Everytime I read about cameras I change my mind.
  7. I checked the field of view on astronomy tools website - I think the smaller field of view can actually be a bonus with extra reach - although until I try I will never know. I am definitely not afraid of monochrome, it's just the some of the common problems of the panasonic sensor on asi1600 - although it may be a case of you hear the problems more than the positive feedback. And also how does 4-5 year old 12 bit monochrome sensor compare with a newer 16 bit colour sensor. I think the cost of 1600mm pro with filter wheel and filters (not astrodon/chroma) is roughly the same as asi2600, so the costs work out similar in that aspect. edit: oh and that's a stunning image btw. I'm always amazed what you can photograph at such a wide angle.
  8. I have been doing this for many years using a star adventurer with a canon 6d and different lenses upto 200mm from dark sky locations. I wanted to get proper scope and EQ mount for a while but I didn’t think it was worth it shooting from the cloudy UK and I didn’t realise bortle 5 skies were good enough for it. After realising I was wrong I bought a HEQ5 and WO zs61. (I wanted a relatively small scope to begin with). next thing I want to get is a dedicated astro camera. And of course going mono makes the most sense. Coming from a landscape photography world, bigger sensor is always better. However this is where I get lost a bit. According to the ccd calculator on astronomy tools website asi183mm pro is the best match for my scope (1.38 arc sec / pixel). Next option would be asi1600mm pro with a resolution of 2.18arc sec / pixel. However I’m slightly worried about this microlensing/reflection issue. Using a relatively wide scope, I may not be able to avoid bright stars all the time. And I know it would bug me if it happened. i know zwo released new cameras recently but asi6200 is way out of my budget. I can probably justify the cost of asi2600 (also 2.15 arc sec/pixel) . I know it’s an OSC and not mono, but the specs seem promising and I know few people mentioned the possibility of using this with narrowband filters. It’s still a relatively new camera so not a whole lot of information on it unfortunately but everyone who had one seems to like it. It would be interesting to compare this setup with a asi1600 for example. - So is the asi183 really the best choice? Or slight under sampling is not an issue? - asi1600 vs asi2600? - I assume it’s still a big jump to go from a full frame dslr to a set point cooled OSC with a smaller sensor?
  9. To answer my own question, i had an email from FLO this morning to say WO have reported these units defective - so i guess that explains it all.
  10. Hi all, I have recently made the jump from star adventurer to a proper mount (heq5) and purchased a small refractor (WO ZS61 with Flat61R) from FLO to use with my canon 6D. I haven't had many clear nights to set up flattener properly until last night. I have initially fiddled with it for few hours and maybe got it 80% correct. But then after reading about it I realized using a filter changes the light path (1/3rd of the thickness of the filter). I was trying to adjust it again last night. I can't quite figure out if I have it right and this is the best this flattener will do with a full frame sensor, or am I still missing something, or do I have a faulty unit? Images below are quarter turn adjustments (which is roughly 0.25mm) bringing the camera closer (images 9358 to 9360)... Best one seemed to be 9359, but I moved it slightly closer to confirm which made it worse, so I tried moving it back a quarter turn again (9361) but it didn't seem as good. Does anyone have any experience with this flattener and a full frame sensor that can help me? Thanks Esen PS - in case the attached images don't work - they can also be accessed via my dropbox: https://www.dropbox.com/sh/xxe0bcxo17zwct1/AADHkN2Te1rtqVISisZmOTb5a?dl=0
  11. So I take it accurate star masks are a crucial step for processing any astro image?
  12. nice one. I never knew there was so much detail around M45! Looks like a tricky one to process with all the subtle detail.
  13. all 3 are great images. 8 minutes on star adventurer is very impressive. was it guided?
  14. lots of subtle detail. the more you look, the more you see!
  15. Thanks Wim. This all sounds way beyond my capability at this stage (both skills and gear) but it's definitely good to learn for future. It's the original sigma 50mm f1.4 lens (not the new art version).
  16. Thanks btw, i was a bit shocked by the gear/exposure length of that photo I forgot say thank you. Yea 6D is not modded. I do landscape photography as well so I didn't want to mod it. But I think next logical step for me would be to have a modded camera and try to capture Ha wavelengths to improve details - at least that seems like the next logical step for me?
  17. thanks for that info, and bloody hell is all i can say 3 down 217 hours to go Well it's not just the exposure though, since it's a mosaic you are going to capture much more detail with the longer focal length unless it was a really low mp camera (which i doubt it). One question with these mosaics.. I assume they would be very difficult without guiding? How do you go back to exact same area of the sky at such a long focal length on different nights? I did a huge milky way pano at 50mm and that was difficult enough to make sure I captured everything correctly. With guiding you can easily go back to a previous spot, or am I understanding guiding wrong? you are definitely right about experience and knowledge part. It's a long process to master it. I get to go back to cyprus for a week or two every summer so at least I get few nights of clear skies guaranteed every year.
  18. I did look at his website. He doesn't list his equipment (as far as I can see), but clearly he has spent a lot of time in astrophotography considering his achievements and portfolio. It's one of those things if I knew for sure it's beyond the capability of a dslr, I'd accept my fate
  19. Just saw it. Quite similar results. Although A7S is one capable camera at high ISOs!
  20. Not sure if I can dither automatically with the star adventurer tracker... Unless it's part of guiding software? I am reading a bit more about star masks to see if it's viable when I have tons of it in the image. But yea, narrowband may be the next step...
  21. Location was exmoor, so as dark as it's going to get in this area. Yea, I understand astro processing is a black art itself. And then you got so many different software with completely different processing techniques to make it more complicated
  22. I have been trying to do that, but after a certain point stars look like dust speckles and image looks very rough as opposed to the smooth image in that link. yea that's what I tend to use. It works to a level, but I can't suppress enough without ruining image quality.
  23. Finally managed to have a proper go at Orion Widefield last weekend. 45x240s (3hours) with Canon 6D and 50mm f2.8 at ISO800. No darks/bias/flats. Stacked in DSS and processed in PS. I am pretty happy with the result but now it got me thinking, how do I go from this to this: https://en.wikipedia.org/wiki/Orion_Molecular_Cloud_Complex#/media/File:Orion_Head_to_Toe.jpg Is it a matter of longer acquisition, or is that CCD territory?
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