Quote:
Originally Posted by AXE
Is this based on the tilt issues discussed before or does the corrector plate not actually remove all coma/ curvature? I thought the RASA scopes were supposed to be fully corrected across the entire image circle.
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The RASA is supposed to be fully corrected across the entire image circle, but that is theoretical correction. In real life there are a large number of manufacturing tolerances that have to be met, both optical and mechanical.
I have not tested a RASA myself, so I don't know how well made they are, but one of the comments, in this very thread, mentioned image tilt. Well, good luck sorting that out in an f/2 system. I would also warn people about the Veloce 200. Recently I had to rip one apart to find the cause/s of poor performance. I was quite appalled by the poor engineering that I found and even the optics were sub standard. Now this is a scope that looks like a Ferrari and it is supposed to be optically very very good.