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Thank you David. You are correct , effective focal length is not a consideration. I am more concerned with FOV and resolution and think the 200mm is just about right with a DSLR 1.6 crop factor. This will change with the increased crop factor of the KAF8300 chip. Perhaps I am looking at this from the wrong perspective.
My first consideration consistent with FOV and resolution is the quality of the optics. Finding a small aperture scope that fits the bill is more challenging than I thought. I'm getting to the stage where I'm not satisfied to settle for less than excellence and if buying another scope is merely a compromise then I'll stick with the apprentices tool in the 200mm Canon.
Thinking this through and elucidating a bit more, I'm looking for a small instrument with excellent optics to replace my 200mm in the hope that I can improve on it too.
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