http://cgi.ebay.com/5x7-Baush-Lomb-C...item3eff466531 Its a B&L Tessar IIb.
I know that a tessar's rear group will form a crappy image, didn't know that anyone offered tessars as convertibles. Its been a while since I looked at B&L catalogs on cameraeccentric.com, don't recall seeing B&L make the offer. Protars, yes, Tessars, no.
My best guess is that the lens was reshuttered in a Volute engraved for a convertible lens. Any suggestions? Oh, yes, the obvious: I don't know everything. Guilty as charged.
Bookmarks