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I went through this exercise around five years ago wanting a quality 5" refractor and an 8" to 10" cassegrain. I settled for a like new second hand TOA-130 and still marvel at its sharpness and contrast, a real keeper. I very nearly bought a Mewlon 210 to complement the TOA however, at the time, a new CN-212 was on offer so I decided to go with it instead. The CN-212 has an 8 1/4" parabolic mirror and in newtonian mode is f3.9 and cassegrain mode f12.4. As in the case of the Mewlons, you can't escape the little spikes on star images owing to Taks' rather thick spider vanes however you do gain much greater brightness on DSO's.
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