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Hi folks, i am interesting to move on new camera but i am confused what to choose. After 11 years with qhy9mono am looking to go on osc camera to reduce time for Lrgb. I am looking for asi2600mc , but i am not sure if this camera can replace a mono. What is your opinion? Or i am thinking to wait the mono version. Thanks Themis |
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| Hi, there's a huge thread about it, "osc a new consideration" take a look at the Latest topics. |
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At risk of sparking a long thread, using OSC takes more integration time to achieve the same SNR as mono. This is because you never shoot luminance and thus 2/3s of the signal is blocked at all times rather than only when shooting with R,G, and B filters. There are other potential reasons some choose OSC and those are discussed in the referenced thread. |
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If you look at the recent OSC thread - there is a link there to a cloudy nights thread on OSC versus mono which I’ve pasted below: https://www.cloudynights.com/topic/682340-monochrome-vs-one-shot-color-%E2%80%93-by-the-numbers-please/ if you have the QE curves of your current camera, transmission curves of your filters and the QE characteristics of the 2600MC (which should be available online), you may be able to compare how much you’d lose by switching to the2600mc. The OSC has a modern BSI sensor so the difference versus your older mono may be less than you’d think and you would have a larger FOV. |
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| I would suggest to get new 2600MM (mono), it will be a good replacement for your current QHY9: slightly larger sensor, much more sensitive and less noisy. For OSC you need to have really good dark skies and even then targets like narrowband are missed. |
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Nadir Astro: Whatever is the OP choice you definitely do NOT need really dark skies to use OSC cameras. At all. My skies are Bortle 6 mostly and I use an OSC camera quite well. The issue, if there is one, is the amount of clear skies nights you have, per month, which can be pretty low in my neck in the woods, never mind good ones. As for narrowband targets I don't even know what are they. |
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andrea tasselli:Nadir Astro: Andrea, that is a common illusion that OSC camera works better under cloudy skies. Sure, you'll get instant color image instead of maybe unfinished mono. But objects are there, they don't go anywhere.  You can always return and complete the image month/year after. In return mono image will always be way deeper and cleaner from noise.As for narrowband, you need to try it once. I know many astrophotograpers who image ONLY narrowband, never broadband. |
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Hi, there's a huge thread about it, "osc a new consideration" take a look at the Latest topics. I hope this isn't starting all over again. |
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Bob Lockwood:Hi, there's a huge thread about it, "osc a new consideration" take a look at the Latest topics. I hear you Bob. I only responded because the OP said the goal was to shoot “faster”. |
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Nadir Astro:andrea tasselli:Nadir Astro: Frankly, my replay was to your statement that you need very dark sky to use OSCs. You don't. You might need a good light pollution filter but that is par for course even for mono. As for going back year after year to the same subject I am a specialist, as my images testify. Out of necessity rather than choice, given where I live. And by the same token you could do the same with an OSC camera, only it is way simpler to do that way. And I know, as I have been shooting LRGB for a very long long time. Frankly I always preferred shooting RGB-Ha-Hb-OIII rather than relaying on the LRGB gimmick, if I could afford to do so. Much cleaner processing and imagery, in my view. The final assertion that there are narrowband targets simply isn't true. They are just subjects that emits mostly in restricted spectrum bands but they can be captured with a colour array just as well, it is just a a different aesthetic choice. |
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| Thanks guys for your answers. I decided to go in mono version. But now i dont know wich company prefer QHY or ZWO? |
