Furthermore, if you force one of these lenses on a IIa or IIIa you will ruin the shutter. Doug -----Original Message----- From: rollei_list-bounce@xxxxxxxxxxxxx [mailto:rollei_list-bounce@xxxxxxxxxxxxx] On Behalf Of Marc James Small Sent: Sunday, April 03, 2005 2:16 PM To: rollei_list@xxxxxxxxxxxxx Subject: [rollei_list] Re: "different types of black boxes" (was: OT / prove it !) At 11:55 AM 4/3/05 -0700, Jerry Lehrer wrote: >BTW, I just finished trying an f2.8 Jupiter 35mm lens in a >Contax IIIa, and it is a perfect fit. Why does it not fit yours? None of the Carl Zeiss Jena 2.8/3.5cm or 35mm Biogons nor its clones, the BK and Jupiter-12, will fit the Postwar IIa or IIIa body. This is the only incompatibility in the entire Contax RF line. Marc msmall@xxxxxxxxxxxx=20 Cha robh b=E0s fir gun ghr=E0s fir!