I understand because of the reformulated (aluminium instead of brass) shutter, that is thicker, and fouls the rear element (or rather vice-versa). Nick --- Marc James Small <msmall@xxxxxxxxxxxxxx> wrote: > 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! > > > > Send instant messages to your online friends http://uk.messenger.yahoo.com