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Alex
Unfortunately we have this obstacle called atmosphere in the way when we image the universe and we are controlled or limited by its characteristics
For lunar and planetary imaging I can achieve close to 1:1 pixel resolution with my Canon 600D by running “live view”on 5 x zoom in BYEOS
As far as magnification and focal ratio of your scope goes the “general rule of thumb”for lunar and planetary imaging is about 5 x camera pixel size on average nights of seeing and 7 x camera pixel size
on nights of good seeing
So my Canon 600D has a pixel size of 4.3 using my 5 x Powermate on 5 x zoom “live view” BYEOS gives me a pixel resolution close to 1:1 and a focal ratio of F/21.5 which is giving me good results
I’ve tried stacking a 2 x Powermate and 4 x Powermate together on various occasions and seeing conditions which gives a focal ratio of F/25.8 and it’s pushing the optics a little too far and the results even after stacking and sharpening are horrible
So my little 6” scope works best at around F/22 max using my Canon 600D
Using a much bigger scope with my camera would require excellent seeing conditions to achieve better resolution and detail , but I’m happy with what my little 6” can do
Obviously dedicated planetary Astro CMOS cameras are in a class of their own compared to my humble DSLR but that’s another story for later
Cheers
Martin
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