Quote:
Originally Posted by ghsmith45
Standard practice--shoot darks longer than your maximum light frame exposure, then if you take varying length exposures (say for a bright cluster, or the inner part of the Orion neb), you can use the same dark for all the different exposure length lights by scaling (eg in CCDStack). If you do this it is essential to take bias frames.
Geoff
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Thanks Geoff, I forgot about scaling, its been so long since I took a pic
. I always apply the master bias when calibrating in CCDstack. Once you setup the drop box menu's they automatically fill each time and after a while you forget what you have done. I just press calibrate all these days
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Mark