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D80 RAW format problem-- making a dark flat for astroph...

elec164

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"RE: D80 RAW format problem-- making a dark flat for astrophotography not working"

elec164 Silver Member Nikonian since 15th Jan 2009
Wed 12-Sep-12 03:00 PM

>On the terminology, I think I meant a "dark" as
>opposed to a "dark flat", which is indeed as you
>describe.
>

OK, just wanted to be sure. There is a flat field correction, but that is generally not used for astrophotography I would think.


>FYI, I've put two images here, one a dark taken as a RAW/NEF
>(whihc looks terrible) and one taken as a jpg, which looks the
>way I think it should look:
>

I downloaded the NEF and opened it in Photoshop CS3 and it appeared black as I expected it to be. I then adjusted levels to bring out any possible sensel variation and a few pixels appeared, but nowhere near what you described. So it appears that it is possibly PSP X2 that is giving you a false rendering.

Pete

Pete

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A topic tagged as in need of help D80 RAW format problem-- making a dark flat for astroph... [View all] , Dr Garry , Tue 11-Sep-12 11:19 AM
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