I've just come into possession of a series IV protar. I've googled for information on this lens and it seems scarce. Yes, I've looked at cameraeccentric.com and looked through all the scanned information. My question is this: where can I find an optical diagram for these lenses? I think the one I picked up must be some sort of Franken-linse, because it appears to have a front and rear element from series IV mated by a Series V barrel of a shorter focal length. A diagram of how it is supposed to look would be a great help.
Thanks!
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