Hi Karl, I saw this lens on ebay and realising its a projector lense I stayed clear from it. They just don`t make good telescopes as mentioned by Mike above as used backwards you just won`t get a crisp image. Have tried it with a older lense and the iamges were very soft even at very low magnification..would work great as a large photographic plate camera but!
sorry about not being very positive.
cheers
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