#1  
Old 16-08-2012, 01:53 PM
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graham.hobart (Graham stevens)
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calibration frames and QHY + Nebulosity

Hello all, I took some subs of the Grus quartet the other night with the QHY 8 OSC using Nebulosity. At the same time ( hours apart) I took darks without moving anything, then flat frames using a light box. The flats on my screen showed a prominent dust bunny as well as the lights. I was hopeful this would be calibrated out but it has remained in the finished stacks.
I calibrated in Neb 3 then stacked the calibrated colour converted files in DSS.
Please tell me what I did wrong as the dust bunny is rather annoying.
I can post samples later when I finish work.
Cheers
Graz
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  #2  
Old 17-08-2012, 01:33 PM
Poita (Peter)
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When you batch pre-processed the files before stacking did you load the flats?
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Old 17-08-2012, 02:00 PM
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graham.hobart (Graham stevens)
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QHY 8 OSC + neb

Pete, I thought I did, but I will re-stack tonight and check. I am sure I added lights + darks 1 and then flats 1.
Will re stack and see if this is the error
cheers
Garz
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Old 26-08-2012, 08:59 AM
TheDecepticon
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Perhaps try loading all your raw files(lights, darks, flats, biases) into DSS and set it up for the QHY8 to allow it to do the lot, rather than using Neb to cal and DSS to stack. You may get a better result.

This is the way I did it when I had a QHY8. I used Neb2 for capture of all raw data and stacked in DSS with good results.

Or, invest in PixInsight, you wont regret it.
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Old 28-08-2012, 02:45 PM
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graham.hobart (Graham stevens)
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QHY 8 OSC + neb

Then debayer the final image ?- or debayer all of them seperately then stack?
I could do this then debayer in Startools- will try it later
Graz
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Old 04-09-2012, 09:50 AM
TheDecepticon
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If you use Deep Sky Stacker, it will do everything for you, including debayer. You just have to set it up to recognise your camera. There is a wiki on how to use it for extra assistance. Just dump in all your files, set it up once and go!
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  #7  
Old 04-09-2012, 10:15 AM
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multiweb (Marc)
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You'd need to subtract the bias from your flat prior to divide it in your light. Might be why it's not getting rid of the bunnies.
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