ironringer Posted February 27, 2021 Share #1 Posted February 27, 2021 Advertisement (gone after registration) Could the historians and collectors inform us about the purpose of the long arrows at the base of early-1930s Elmar and Hektor 135mm lenses? Forum member " tranquilo67 " showed us examples (picture copied below) in April 2020, in a discussion about "The Earliest Standardized Screw Mount Lenses" that was started by Alan McFall. Perhaps these arrows show where the lens should be positioned, at the 12 o'clock top of the camera's mount ring, to start screwing in, to ensure that the tripod mount ends up at the bottom when fully screwed in? Clarification will be useful. Welcome, dear visitor! As registered member you'd see an image here… Simply register for free here – We are always happy to welcome new members! 1 Quote Link to post Share on other sites Simply register for free here – We are always happy to welcome new members! ' data-webShareUrl='https://www.l-camera-forum.com/topic/318405-purpose-of-arrows-on-1930s-135mm-lenses/?do=findComment&comment=4149637'>More sharing options...
Advertisement Posted February 27, 2021 Posted February 27, 2021 Hi ironringer, Take a look here Purpose of arrows on 1930s 135mm lenses?. I'm sure you'll find what you were looking for!
luigi bertolotti Posted February 27, 2021 Share #2 Posted February 27, 2021 (edited) This was (incidentally) discussed recently : there was not a definitive answer, but probably some correct conclusions Edited February 27, 2021 by luigi bertolotti 1 Quote Link to post Share on other sites More sharing options...
tranquilo67 Posted February 27, 2021 Share #3 Posted February 27, 2021 Hi, Very interesting!! I've never thought about that arrow!! (by the way it's nice to see pictures of my own gear in other post!! ). The first thing I thought was that it could be something similar to the red dot in the M mount (how to position the lens for mounting), but I've mounted them and I think it can be more related to this: Welcome, dear visitor! As registered member you'd see an image here… Simply register for free here – We are always happy to welcome new members! The arrow, when the lens is fully screwed into the camera points to a noch in the side of the camera mount at 9 o'clock. My understanding is that it's intended to ensure the lens is screwed properly, not too loose, not too tight. As a matter of curiosity, all my screw mount bodies have that notch (a bit different in the IIIg) but the arrow seems to be only in the 135mm focal length, and only from the early 30's. It's not in my fat Elmar, Mountain Elmar, or later Hektors (I have models from 1937 onward without it). Anyway, any other information experience will be very much appreciated. Best wishes and stay safe, Augusto Quote Link to post Share on other sites Simply register for free here – We are always happy to welcome new members! The arrow, when the lens is fully screwed into the camera points to a noch in the side of the camera mount at 9 o'clock. My understanding is that it's intended to ensure the lens is screwed properly, not too loose, not too tight. As a matter of curiosity, all my screw mount bodies have that notch (a bit different in the IIIg) but the arrow seems to be only in the 135mm focal length, and only from the early 30's. It's not in my fat Elmar, Mountain Elmar, or later Hektors (I have models from 1937 onward without it). Anyway, any other information experience will be very much appreciated. Best wishes and stay safe, Augusto ' data-webShareUrl='https://www.l-camera-forum.com/topic/318405-purpose-of-arrows-on-1930s-135mm-lenses/?do=findComment&comment=4149769'>More sharing options...
thomas_schertel Posted February 27, 2021 Share #4 Posted February 27, 2021 The notch is needed for the Visoflex I too yours sincerely Thomas 1 1 Quote Link to post Share on other sites More sharing options...
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