Archived posting to the Leica Users Group, 2000/07/26
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]On Wed, 26 July 2000, CapsTeeth@aol.com wrote: > > In a message dated 7/26/00 1:31:12 PM Eastern Daylight Time, > sdmp007@pressroom.com writes: > > << CapsTeeth, > Changing the bayonet mount yourself withOUT having the proper > calibration tools is foolish. The flange distances are critical for sharp > focus. >> > > I've never changed an R lensmount, but I've done several Nikons and Leica M's > and the mounts fit flush with the body casings with and the screws tighten > into their threads until they are tight, just like rear lensmounts. There > aren't any provisions for "calibration". I checked with Fargo Enterprises > and they didn't seem to know what a "lens mount calibration tool" was. > Perhaps Leica R cameras are different. I haven't changed lens mounts, but I've removed and replaced 'em when ) replacing broken plastic lens release tabs on SL bodies ) replacing the main casting of a broken R4sP and on neither camera were there any calibration adjustments. This issue is more important with an M than with an SLR because with the SLR, whatever's in focus in the viewfinder (assuming correct mirror & viewscreen alignment) will be in focus at the film plane. The only "calibration" problems I've heard of are on FD-series Canons. The lens mount was positioned at the proper distance from the film plane at the factory with shims between the mirror box casting and the flange; a good whack could shift the shims enough that the plane of focus was no longer parallel to the film. This is all in the cobwebbed corners of my memory; can anyone confirm this? My SL and R4sP seem to have been made precisely enough that shims are not nessesary. Doug Herr Sacramento http://ourworld.compuserve.com/homepages/telyt ___________________________________________________ The ALL NEW CS2000 from CompuServe Better! Faster! More Powerful! 250 FREE hours! Sign-on Now! http://www.compuserve.com/trycsrv/cs2000/webmail/