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Marko, don't get hung up on not cropping anything. It's inevitable with anything less than perfect framing on the ideal sized objects. In reality, objects come in all shapes and sizes. This is also why one single scope isn't going to cover your bases, because of the focal length giving different FOV regardless of what camera you use.
But don't undermount. If you go for a small to medium refractor then AZ-EQ6. For anything bigger than a C8 you probably want the EQ8.
Picking a long focal length instrument as a first step is an interesting challenge. There's a lot of satisfaction to be had from subjects in the 400-800mm focal length range. Reducers for the C11 Edge series should give you a pretty good image across the sensor, but you're looking at about 2m focal length and a lot of weight, not to mention cost. Currently there's no reducer for the C9.25 Edge, so you're stuck at f/10 and 2350mm.
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