B&L 7.5cm Telephoto Lens
The 7.5cm Bausch & Lomb Telephoto lens for the Argus C2 and C3 cameras qualifies as a rare lens, certainly it's uncommon. I have kept a record of serial numbers of lenses that appeared on the internet over the past decade. I am curious whether there are any more among RFF'ers, and whether any new information has been found.
L David Tomei