Hi there.
What can 17” of aperture achieve at f6.8 under pristine dark skies with spectacular seeing?
Check out the attached….this is a single 15 minute sub in each RGB channel. I didn’t even bother to calibrate it. I used hot pixel rejection in CCDStack, registered, and then combined. No other processing whatsoever. FWHM of all 3 frames was 1.1 asp.
Data of this quality is hard to come by - so subscribing to my Chilean based CDK may just interest you
Cheers
Martin