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Mike - the Newt can do Medium widefield work with the right corrector... a 0.73x Keller Corrector will bring it back to F/3.65 and 730mm F/L..
Being someone who's owned every common optical system on the planet, from my perspective I see no reason to keep two scopes that have the same (within 100mm) focal length, when one has double the aperture... 8" F/5 vs 4" F/9 for visual or photographic work, I would chose the 8" in every situation for any task.
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