This seems to be a kind of near-focus-lens design, with this lens consisting of segments of different FL's which are swung into position by pivoting this lens respectively. (It's found in the Polaroid Image/Spectra cameras. I've not yet disassembled this type of camera...)
Originally Posted by erikg
Last edited by AgX; 05-13-2013 at 10:31 AM. Click to view previous post history.