[Quark (Trevor)]

Originally Posted by kinetic

Hi Trev,

Here is an old bookmark I have which gives a good, overall
theory of Darks , Bias and Flats , with some examples of why
you need to do them. (examples of Dust bunnies, vignetting etc)

http://www.aavso.org/observing/progr...manual/3.shtml


Hope this helps,

Regards,

Steve

Thanks Steve,

A very informative and graphic link, a picture really is worth a thousand words.

Regards
Trevor