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In time of film photography, I tried to use right angle finder for my Praktica.. I even built a special microscope for the purpose and it was useful for Moon and bright stars (used with matte glass only, of course,)... However, to find faint objects, right angle finder was totally useless, with or without microscope. I could used it only without any matte glass (as a low power eyepiece), buy then the focussing had to be done earlier (on a bright star).
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