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Old 21-07-2014, 04:08 PM
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Amaranthus (Barry)
Thylacinus stargazoculus

Amaranthus is offline
Join Date: Jan 2014
Location: Judbury, Tasmania
Posts: 1,202
Either - there is arguably little to be gained over a BPM, and much to be introduced (noise wise) by using Darks. The advantage of a BPM is that it will only fix (interpolate from surroundings) the bad pixels you designate (which you have control over, anywhere from 0 to 100s) and will leave every other pixel clean and untouched.

You really only have to match exposure and take a few frames to get a decent BPM, and even this is not critical like with Darks. In theory you could take a suite of long exposures (e.g. 10+ min), create a (bias-subtracted) Master Dark from these, and then just tune your BPM to match your actual exposure (fewer pixels for shorter subs). Keep the same Master Dark for months then, and forget about temperature matching etc.
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