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Chris, Your 8" Newt was undermounted on an EQ5, need at least an HEQ5.
If your cameras wouldn't focus, you hadn't done your research, and had bought a Newt optimised for visual.[which is to say, most Newts].
You can't beat the laws of Physics, the 200mm has 5x the light gathering power of a 90mm. The secondary reduces light gathering by around 6%,
negligible. Your images may well be as bright, but will not show as much
nebulosity or colour, [for the same length sub],and on objects full of detail such as the moon will not show as fine a detail. Resolution is a function of
aperture, so the finest optics known to man will not allow a 90mm scope to
resolve detail as small as a 200mm will. Horses for courses.
raymo
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