Archived posting to the Leica Users Group, 2001/06/06
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]A denizen of the Hexar list has suggested that this difference is explained by the different pressure plate geometries of the two cameras, and that if one were to measure flange-to-FILM distance instead of flange-to-pressure plate distance, the descrepancy would vanish. Apparently in the Hexar the film rides on inner rails that are set lower than the outer rails on which the pressure plate rests, by about a film's thickness. In contrast the Leica has a single set of rails - the film rides on them, and the pressure plate rests on the film - meaning that when there is film in the camera the Leica's pressure plate is moved back from its original position by the thickness of the film. Seems like a logical explanation to me, and it indicates that there has never been a problem, as long as you always have film loaded in your camera when taking pictures... Paul - -----Original Message----- From: Paul Chefurka Sent: Wednesday, June 06, 2001 10:15 AM To: 'leica-users@mejac.palo-alto.ca.us' Subject: RE: [Leica] Re: Hexar Back focus It does leave the nagging question of the nominal back focus in each case - the Leica's 27.8 and the Hexar's 28.0. Paul