This is a test series of 4 * 20 minute subs at ISO 400 using an unmoddified DSLR with a CLS filter and in camera noise reduction, the image taken in my back yard over 2 nights..No bias or external darks were used but flats were stacked.
http://i1154.photobucket.com/albums/...INSICDRPS1.png
Am still trying to grips with all the discussions on more subs, less subs, SNR, how many darks, use of Bias etc, so I decided to step right back and get back to basics. Basic rule of thumb, less ISO and more signal.
Am pleased with reduction in my usual level of noise and with how well the image held out on processing but would value further feedback as I think that for a DSLR this process seems to be effective. Tweaks in setup needed as slight egg in some stars to the right of the image.
Thanks for looking