geesbert Posted March 1, 2011 Share #1 Posted March 1, 2011 Advertisement (gone after registration) I managed to acquire a really beautiful collapsible Summicron with pristine glass and near mint barrel, though the small index dot for the f-stops is not in line with the focus mark, but rather 10° to the left. Is that normal? I know it wont affect performance, but you know.... is there an easy fix to rotate the front bit of the lens to get it in line with the rest of the lens? Link to post Share on other sites More sharing options...
Advertisement Posted March 1, 2011 Posted March 1, 2011 Hi geesbert, Take a look here Collapsible Summicron f-stop index. I'm sure you'll find what you were looking for!
geesbert Posted March 1, 2011 Author Share #2 Posted March 1, 2011 The rotation is like in this image, mine is not black, I want to add. Link to post Share on other sites More sharing options...
doubice Posted March 2, 2011 Share #3 Posted March 2, 2011 It is normal. Many older Leica lenses, particularly those made in Thread Mount, had an offset f-stop dial. Reason was that, often there was an accessory finder sitting in the camera's shoe and had the f-stop index been in the center, it would be difficult to see the set aperture. One would have to sort off look around the accessory finder. Even though your Summicron is an M mount lens, it was available in Thread Mount as well and I guess Leitz kept the collapsible mount alignment identical between the two mounts. You can rest at peace, the horizon in your photos will stay perfectly horizontal. If not, it won't be the lens' fault...... Best, Jan Link to post Share on other sites More sharing options...
luigi bertolotti Posted March 2, 2011 Share #4 Posted March 2, 2011 I have one with the same rotated index, but is in screw mount : most items in BM I have seen (books / Net...(*)) do have on the contrary the index aligned with the focus mark: but agree with Jan that probably isn't a general rule. Link to post Share on other sites More sharing options...
iphoenix Posted March 3, 2011 Share #5 Posted March 3, 2011 It is normal. [Many older Leica lenses, particularly those made in Thread Mount, had an offset f-stop dial. Reason was that, often there was an accessory finder sitting in the camera's shoe and had the f-stop index been in the center, it would be difficult to see the set aperture. One would have to sort off look around the accessory finder.] Even though your Summicron is an M mount lens, it was available in Thread Mount as well and I guess Leitz kept the collapsible mount alignment identical between the two mounts. You can rest at peace, the horizon in your photos will stay perfectly horizontal. If not, it won't be the lens' fault...... Best, Jan Thank you Jan, I was wondering about that myself. I also have some R/F Canon cameras& lenses which have the same off-set. A so-called "repairer" once returned a Canon body to me with the mount turned around so the lens indicators were at the bottom. He couldn't understand why the off-set was there. Now, I am enlightened and I thank "geesbert" for the question. David Link to post Share on other sites More sharing options...
doubice Posted March 3, 2011 Share #6 Posted March 3, 2011 .......Many older Leica lenses, particularly those made in Thread Mount, had an offset f-stop dial. Reason was that, often there was an accessory finder sitting in the camera's shoe and had the f-stop index been in the center, it would be difficult to see the set aperture. One would have to sort off look around the accessory finder...... Best, Jan Actually, to be exact - it was not just the f-stop dial that was offset, even the focusing index was off to the side for the same reason quoted above. Best, Jan Link to post Share on other sites More sharing options...
UliWer Posted March 3, 2011 Share #7 Posted March 3, 2011 Advertisement (gone after registration) If you want to compare the index position iof a few screw mount lenses you may have a look here: http://www.l-camera-forum.com/leica-forum/leica-sammler-historica/116802-endlich-dabei-2.html#post1274542 Link to post Share on other sites More sharing options...
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