Archived posting to the Leica Users Group, 2000/02/18
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]At 1:49 PM -0800 2/18/00, Robert Rose wrote: >Improvements can be patented over prior art, and that is what they did. >The two critical patents I have found so far are Wehrenfennig '581 and >Brohl '201. Wehrenfennig teaches the use of 4 lugs on a bayonet arranged >so that light coming from long focal length lenses, or of high intensity, >is not cut-off in 35mm cameras, and Brohl teaches the use of protuberances >or notches to align the lens and camera body. Any theoretical advantage of a 4 lug system was never utilized by Leitz as far as I know. If you look at any M lens, there is a continuous circle of metal, except for the rangefinder cutout, inboard of the lugs. For there to have been any advantage re: vignetting the metal between the lugs would have to have been cut away. * Henning J. Wulff /|\ Wulff Photography & Design /###\ mailto:henningw@archiphoto.com |[ ]| http://www.archiphoto.com