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Hi 1of1
not sure if you need one.
Let me put it this way. For planetary, and some lunar imaging you need either a 5x or sometimes slightly less (not sure of the native focal length of the CNGT, but I suspect about 1000mm??).
BUT....... if lunar/planetary imaging you will tend to use a ToUcam or similar, not the 350D. While there is no reason why you can't use the 350D, I reckon a few attempts will point you in the direction of a ToUcam.
For DSO imaging you will likely need to "go the other way" and use something like a focal reducer/field flattener/coma corrector. This is where the 350D is a winner.
So it depends on what sort of imaging you were thinking of.
Gary
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