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Old 12-10-2015, 08:12 PM
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Shiraz (Ray)
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Shiraz is offline
Join Date: Apr 2010
Location: ardrossan south australia
Posts: 4,822
Originally Posted by Camelopardalis View Post
Thanks Ray, it was your thread that originally got me thinking and inspired me to ask more

I haven't yet found a way to analyse the raw pixel values in the raw files, but just going on PI's normalised values, but loading up one of the raws I took fresh this past weekend at a dark site and a bias file (and debayering both), the background values seem to hover around 0.033-4 whereas the bias file is it looks like exposing to about 25% just eeks it past the line. So if I understand it correctly it looks like I should expose for just a little longer from a dark site.

This is ignoring the dark current of course...which in the warmer evenings is noticeably higher than on the colder nights
sounds like a plan to me Dunk - a bit more exposure may be useful provided the dark noise does not get in the way.

High dark current is not all bad - if you have a lot of noise, you can use shorter subs because the results will be so bad that it doesn't make any difference

Last edited by Shiraz; 12-10-2015 at 08:25 PM.
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