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is it for visual or photographic purposes or both?
visual
How much does it reduce the focal ratio eg 0.7?
0.5
Will it screw in to Celestron 2"? If not, do you know of an adapter that would work?
not sure - it is designed to screw into a 2 inch diagonal on SCTs. I have little doubt that the threads on any Celestron or Meade 2 inch diagonal would accept this unit.
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