Archived posting to the Leica Users Group, 2012/04/05
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]Also, look at the old 35mm f2.8 biogon, the one made in the 1930s, and the Soviet copy of it, the Jupiter 12. Compare them to the modern ZM C-Biogon 35mm f2.8 Here's a page with good photos of the Jupiter 12. http://cameras.alfredklomp.com/jupiter12 I have the ZM C-Biogon. The rear element is smaller in diameter and does not stick into the camera nearly as far. I've handled a J-12 and the real element is gigantic and nearly touches the shutter of a Leica! It fits and works, but barely! The new ZM C-Biogon leaves more room behind the lens, so it'll be compatible with the Zeiss Ikon M-mount camera and the Voigtlander Bessa cameras made by Cosina, whose metal shutters would be hit by the rear of the old lens design. The ZM one has to be retrofocus for it to stick less far inside the camera. It is not as strongly retrofocus as 35mm lenses for SLRs have to be, but it is retrofocus. -- Chris Crawford Fine Art Photography Fort Wayne, Indiana 260-437-8990 http://www.chriscrawfordphoto.com My portfolio http://blog.chriscrawfordphoto.com My latest work! http://www.facebook.com/pages/Christopher-Crawford/48229272798 Become a fan on Facebook On 4/6/12 1:03 AM, "Marty Deveney" <benedenia at gmail.com> wrote: >On Fri, Apr 6, 2012 at 2:32 PM, Richard Man <richard at richardmanphoto.com> >wrote: >> zM Biogons are not retrofocus? This is for the Leica M, not one of the >>ZE >> or ZF > >Look at the block diagram and where the rear element is relative to >the mount. Of course they're retrofocus. > >Marty > >_______________________________________________ >Leica Users Group. >See http://leica-users.org/mailman/listinfo/lug for more information