[lookus]

have spoken to several people regarding dark subtraction using DSS (or similar) as opposed to using the in camera noise reduction function(canon camera) and am getting mixed responses.

fo example- am i better off taking 10 x 10 min subs with ICNR turned on ( so 1x10 min sub really takes 20min) and then stacking these 10 frames in DSS?

or

am i better off taking 20 x 10 minute frames( spending the time taken doing ICNR and taking more light frames) and then stacking these 20 frames in DSS.? my idea here is to build a library of dark frames for various exposures and temperatures. so i would initially have to invest some time in building the library but these dark frames could be reused for a while.

i am very interested to hear peoples opinions on this and what they think is better.