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As this site has shown very clearly these last 2 years, incredible images can be achieved with smaller aperture high quality optics (which are becoming easier and easier to get) and a smallish CCD like the Sony sensors or the KAF8300.
100mm, 106, 120, 130. All good. Whatever you can afford. Larger sensors is where the cost rises exponentially for a smaller and smaller gain.
KAF8300 coupled with a 120mm scope should nail every bright extended object with years of imaging choices and do very very well.
3nm narrowband filters have also shown that dark skies are not a prerequisite either except for LRGB imaging.
Greg.
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