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It's always a good idea to play to the strengths of a telescope, I would not get the 0.73x reducer you will probably find you end up with an unsatisfactory image on newer cmos cameras that have smaller pixels like the qhy163m. If you have a limited budget and still want a wide field, an ed doublet is a really good choice especially if you are shooting in mono. You are already set with your 200mm F5, that will handle most DSO targets, more if you create mosaics, also planetary with a 2-4x barlow. You might find many scopes arriving on the used market with the economy the way it is.
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