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Old 10-11-2018, 07:44 AM
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Peter Ward
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Peter Ward is offline
 
Join Date: Dec 2007
Location: The Shire
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Quote:
Originally Posted by ChrisV View Post
Might be an old chesnut for some but not for me.

I've been calibrating my darks and flats with a master (super)bias in PI. Then calibrating my lights with these and the bias frame. Similar to this
http://www.lightvortexastronomy.com/...ixinsight.html
Writing it out now - it kind looks like a grammatically incorrect double negative?

So am I better off calibrating lights with darks and flats with dark flats. Then calibrating my lights with these calibrated darks and flats?

Sorry to hijack this Andy ...
All you need are 5 to 9 or so Median combined, auto dark subtracted sky flats (one set for each filter)
and the around same number of darks (which match light frame exposure times) . Bias frames are not necessary, but can be used if don’t have darks for some odd reason.

I use MaxImCCD to calibrate data frames, but there are many alternatives.
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