Thread: Calculating optimal exposure length for astrophotography
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Old 10-05-2010, 10:15 AM
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Manav (Yugant)
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Question Calculating optimal exposure length for astrophotography
Hi Everyone,

I have a question regarding optimal exposure length for DSLR (Canon 50D) when conducting in LP areas such as Sydney. Just to give you background I live in Sydney and use the Astronomik LPS clip-in filter. I've read several articles online and can't figure out how to find the ideal exposure time for astrophotography. My light frames range from 30sec to 3min and I would like to know if there is an way/program that will help me get optimal data so I can spend more time taking same exposure length images instead of changing ISO/exposure after every shot?

Furthermore, recently, I've also started to look at using a lightbox for creating flats. Once again how do I calculate the exposure time required to get the best flat image? I know there is a target ADU to reach but how do I calculate what that is for my Canon50D?

Thanks for your help!

Regards
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