Quote:
Originally Posted by Bassnut
Thats very odd, makes no sense to me   |
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