ETX 80 and 90 are completely different scopes (80 being a short wide field refractor and 90 being a long focal length mak-cass). ETX 80 would be much easier for wide field imaging and be more forgiving with tracking error given the focal length, however, alot of CA will be apparent in the image. The etx 90 will require very long exposures given the f/13.8 f-ratio for DSO imaging and really it is not very possible for a complete beginner to obtain a nice image of a DSO with this scope. Also, a large DSLR will likely not be fully illuminated by the small secondary of the scope, thus leading to significant vignetting. I'm sure planetary imaging would be suitable for the ETX 90, but you would need to buy a modded webcam because a DSLR would likely not suffice.
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Re: 80 or 90 for imaging?
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