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I don't live in a city but 100km away. Also live 1000m above ground. I do get crystal clear skies with visual down to 5mag
I also help out at the local observatory who is also teaching me stuff with will include astrometrics, they have a large 24 inch at 4000fl and what they told me was this is about the longest fl you can go at this location, and what is wrong with a 12"? It has good light resolving power and a good focal length. I'm not new to astrophotography I'm upgrading my gear from a fl of 1000mm. I wanted more resolution and light power. I also spent time doing Ccd research to match up with the telescope. I should also mention at the observatory they do fwhm, on clear nights it 1.02 and most nights around 1.2 to 1.5. If I have any left over from my budget I would get a 14 inch Rc.
As the camera needs a m68 connecter 3" is the biggest I need to go.
The Kaf 16200 may be good on smaller scopes, but it's QE is very low.
I'm would like to see what other people say.
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