Quote:
Originally Posted by codemonkey
Maybe a silly question, but if you have a good master bias, can't you use dark frame scaling to reduce the number of darks you need to take? As you say though, not hard to do if you have the time.
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I grab darks for my most common sub durations but I do use scaling as well, e.g. for 20 minute subs which I sometimes do for LRGB at a dark site.
Quote:
Originally Posted by roughy
Hi Rick
How many library bias frames do you take and how often do you replace them?
Cheers
Mark
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Bias frames are easy so I typically take several hundred of them. This time around I got 800. Based on my camera parameters that should give me a SNR of around 6000:1 in the master bias.
I do new calibration masters when the old ones don't appear to correct so well any more and I see significant numbers of hot pixels in calibrated lights. The last time was around 8 months ago, I think.
Cheers,
Rick.