straw_man Posted May 31, 2015 Share Posted May 31, 2015 My Leica screw mounts and postwar Zeiss Contax lenses are locked when set at infinity. Easy to unlock, but why are the locks there in the first place? Link to comment Share on other sites More sharing options...
SCL Posted May 31, 2015 Share Posted May 31, 2015 <p>It makes them easier to mount & dismount from the camera body.</p> Link to comment Share on other sites More sharing options...
john_shriver Posted June 1, 2015 Share Posted June 1, 2015 <p>For the Elmar 50/3.5, it's just to give you a grip.<br> On the other lenses, it's a handle to prevent you from putting torque on the bars in the focusing helical that keep the lens proper from rotating. Done repeatedly, that can make the helical loose.</p> Link to comment Share on other sites More sharing options...
tony_lockerbie Posted June 1, 2015 Share Posted June 1, 2015 <p>As the others have said, but they still manage to annoy me :)</p> Link to comment Share on other sites More sharing options...
straw_man Posted June 2, 2015 Author Share Posted June 2, 2015 I agree with the reasons for their origination. Most of my lenses are constrained from adjusting the range past infinity or closer than the minimum allowed, so I see infinity locks are largely useless. Link to comment Share on other sites More sharing options...
Troll Posted June 2, 2015 Share Posted June 2, 2015 <p>The early Leica lenses focused by rotating the lens. Even the Leica A had an infinity lock. I believe that it was to assure the photographer that the lens had not been left or accidentally moved to a closer focusing distance, which was an easy mistake to make.<br> Personally, I like them and feel more comfortable using a lens with the infinity lock, even on parallel-focusing lens mounts.</p> Link to comment Share on other sites More sharing options...
Brian1664876441 Posted June 2, 2015 Share Posted June 2, 2015 Sometimes it takes some force to get those lenses off the camera. I appreciate an Infinity Lock that does not put the stress on the body of the lens or the helical after using the Jupiters. Don't like Infinity Locks- easy to remove, or get a Jupiter. Link to comment Share on other sites More sharing options...
james_elwing Posted June 7, 2015 Share Posted June 7, 2015 <p>Also on Canon & Schneider-Kreusnach LS-TM lenses. I guess for landscapes, the lenses are pretty much always within focus as soon as the lens cap's off, even at wide apertures. They are only ever on 28/35/50 lenses, where this is the case, and not always used; eg on the Summaron 35 f3.5 with M3 goggles. <br> I don't mind them, as long as they remain easy to unlatch. They are more of a problem when focusing gets stiff, and that's something that should be attended to anyway.</p> Link to comment Share on other sites More sharing options...
glen_h Posted June 8, 2015 Share Posted June 8, 2015 <p>The Canon 135/4.0 doesn't have one, but the focus ring is far enough out that there is a place to grab the barrel closer to the mount. </p> <p>Yes, it is very inconvenient to have to focus the lens all the way out when removing it, and it probably puts strain where it shouldn't be. Not so obvious the other direction.<br> But the 135/4.0 doesn't have a full ring for the rangefinder coupling. I think for that one, you are supposed to run it all the way out first to reduce wear on the rangefinder mechanism.</p> -- glen Link to comment Share on other sites More sharing options...
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