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Well the Redcat 51 is a great little widefield scope/lens. But as you say 51mm is pretty small. I use mine as a DSLR type widefield scope to get large objects in a broad vista.
There are some fabulous examples of what can be achieved with 71mm scopes on this forum. Andy's work stands out. I am often amazed at what he achieves with a small refractor from his inner city location.
The refractor will give pleasant stars and sharp widefield images.
If you live in light pollution then you can simply get narrowband filters and do narrowband imaging like Andy does.
The RASA is 200mm in aperture and that is pretty large. It would compete with the Skywatcher 8 inch RC scopes that routinely put up great images.
I am not that familiar with RASA images but F2 does sound seductive if the stars look good and its sharp. I suspect its up against a number of good imaging scopes for the same price though. 8-10 inch F4 Newtonians are also popular with lots of fabulous images from them as well.
Greg.
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