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Further to Ericks comment re AFOV, at the shorter focal length end of a zoom, you may find that images are not as clean or sharp at the edge of the field as you would get with a short FL angler or similar. With a slow scope like a C9.25 you may find it still OK, but from reports I have heard in a fast Newt they can be a bit ordinary. Especially as the AFOV is quite narrow it can bet a bit irritating.
Malcolm
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