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Hi Scott,
When you say blurry do you mean out of focus or misty? Or both?
I have a GSO finder that was like that. In focus but foggy. The foggy bit came from the eyepiece part so I pulled that apart cleaned it up like I would with cleaning eyepieces and put it back together….like new. I made sure it went back in the order the lenses came out. Pretty simple really.
It could be someone has pulled apart the objective and put it in back to front??? I don't know if the 50mm finders have an air spaced doublet or cemented one, so one or both lenses might be the wrong way round.
Have a look and see, just remember what went where.
Matt
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