I picked up this lens at a flea market for $20. There was no spacer between the two rear elements, so one was rattling around, and they may have thought it broken. I made a new spacer out of cardboard, and everything is tight now, but I have several questions:
- Is it a petzval?
- Are the rear elements oriented correctly?
- Is this a lens for a slide projector? I assume that is what the slot in the front is for?
- Any idea of a maker? There is no script on the barrel or edges of the elements. Only mark is 6 1/2" on the front cover.
Can it be used in either direction? Seems like the cover could easily be converted to a flange.
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