Now that I think about it, I have not seen any tessar type 35mm SLR lenses with 40mm focal length, all I have seen are 50mm. which tessar 40mm lenses are for 35mm SLRs? What mount? Even if the lens optical design was only 10mm from front to rear element, the rear element would be only 35mm from film plane making it 10mm deeper than the flange on M42/PK mount. Anybody know what the specification is on M42/PK with regards as to how deep the lens elements can go below the flange distance? JCO
-----Original Message----- From: Andre Langevin [mailto:[EMAIL PROTECTED] Sent: Wednesday, December 01, 2004 5:18 PM To: [EMAIL PROTECTED] Subject: RE: OT: Odd Focal Length >2. 58mm was minimum focal length possible without having >to resort to a retrofocus optical design. > >JCO Not sure I understand... Much shorter lenses were produced without a retrofocus design, for example the Tessar lenses, up to 40mm. Andre
