Purely as a bit of fun I thought I would give a direct comparison of what aperture, focal length, mount, telescope, seeing and AO makes
Oh and don't mind the blue halos, hoping a blue filter which doesn't let quite so much UV light through will combat the 60%+ QE of the ICX694
Peter's Keyhole
My Keyhole
Mine is 10x120s RGB (1 hour total). I have 5 hours of Ha from my previous telescope setup that I tried adding into it but it was TERRIBLE,
it did not blend. As this was just a bit of fun I didn't put in the time to get the stars to play nice.
After seeing Peters fantastic effort I did get to wondering how a tiny setup in comparison would do. You can see quite clearly that my stars are not round at the moment, I think that may have been a balance issue on the night, either that or I didn't have enough settling period in PHD, not sure. After I cropped and registered my images against Peter's I did a FWHM check. Mine was basically twice that of Peter's JPEG so that gives some indication as to the resolution difference between the images.
If I have had had better tracking (round stars) it would have sharpened it up a fraction more but ultimately it was just an fun exercise. Yes, gives me aperture fever