Thread: Sky flats
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Old 16-08-2015, 03:40 PM
SpaceNoob (Chris)
Atlas Observatory

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Join Date: May 2012
Location: Canberra
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Quote:
Originally Posted by gregbradley View Post
Humi that gain should be multiplied not divided but the ADU levels seem right.

Mark if you want to go super in depth then this paper by Richard Crisp whilst perhaps a bit overtechnical has some nice summarisations and principles in it:

http://www.narrowbandimaging.com/inc...3_expanded.pdf

Page 103 actually says the suggested ADU level (ADU= analogue to digital units = number of electrons).

Also the number of flats for 8300 sensor is 5-8 in an earlier page.

Another interesting point in the paper is if your RAW images are brighter then you need brighter flats.

Greg.

I found this guide quite amazing.

I went in fairly blind after using an 8300 and tried the same methodology with the 16803, it didn't work and the flats were completely under correcting. After reading through the guide and doing some analysis of my own system properties, then adjusting things I ended up with perfect flat fielding.
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