piblondin Posted February 24, 2011 Share #1 Posted February 24, 2011 Advertisement (gone after registration) I really like this little lens, but the images in the focusing patch don't line up at infinity--definitely not when focusing on a star in the sky and not even when focusing on something a couple hundred feet away. Therefore, I end up going to infinity on the distance scale for things that are not really at infinity. Is this a problem? (I don't usually use f/2 when photographing things at distance, so I haven't noticed it.) Can it be fixed? My M lenses coincide at infinity fine on my M8. My 40mm Summicron coincides at infinity on my M6. Link to post Share on other sites More sharing options...
Advertisement Posted February 24, 2011 Posted February 24, 2011 Hi piblondin, Take a look here 40mm Summicron Infinity Focus on M8?. I'm sure you'll find what you were looking for!
lct Posted February 24, 2011 Share #2 Posted February 24, 2011 Curious that it works fine on the M6 but not on the M8. May be due to the sloping focus cam of the 40/2 perhaps i don't know. Never seen this with none of my 40/2s on M3, M4-2, M6J, R-D1 or R-D1s so far. FWIW. Link to post Share on other sites More sharing options...
Erik Gunst Lund Posted February 24, 2011 Share #3 Posted February 24, 2011 Mine behave in the same way on my M8,,, Link to post Share on other sites More sharing options...
jaapv Posted February 24, 2011 Share #4 Posted February 24, 2011 The helicoid throw is shorter and thus less exact than regular M lenses. Reason Leica has always advised against the use of this lens, that was designed for the CL, on M cameras. You must get lucky to have a lens that coincides at infinity. However if the images are good, just disregard. Link to post Share on other sites More sharing options...
tobey bilek Posted February 24, 2011 Share #5 Posted February 24, 2011 Like jaapv said, Leica would not guarantee CL lenses proper focus on M cameras. Link to post Share on other sites More sharing options...
lct Posted February 24, 2011 Share #6 Posted February 24, 2011 Leica wanted us to buy M lenses instead of CL ones for more down-to-earth reasons if you ask me. Actual focus problems are rarely reported on M bodies and my 3 copies of the 40/2 have always worked flawlessly with my 3 Ms and 2 Epsons as far as focus accuracy. Link to post Share on other sites More sharing options...
Erik Gunst Lund Posted February 24, 2011 Share #7 Posted February 24, 2011 Advertisement (gone after registration) Leica wanted us to buy M lenses instead of CL ones for more down-to-earth reasons if you ask me. Actual focus problems are rarely reported on M bodies and my 3 copies of the 40/2 have always worked flawlessly with my 3 Ms and 2 Epsons as far as focus accuracy. Agreed no focus issues but the question was: Does the rangefinder 'image' coincide at infinity? Link to post Share on other sites More sharing options...
jaapv Posted February 24, 2011 Share #8 Posted February 24, 2011 Well, using a real Leitz lens, not a copy, I am lucky that it focusses flawlessly, albeit after being fine-tuned by Will van Manen. However, even it the film days, the main complaint was indeed non-coincidence on infinity. Real focussing problems were rare. I think Leica wanted to avoid complaints and tinkering with returned lenses. Link to post Share on other sites More sharing options...
lct Posted February 24, 2011 Share #9 Posted February 24, 2011 Agreed no focus issues but the question was:Does the rangefinder 'image' coincide at infinity? Always did for me. Link to post Share on other sites More sharing options...
ho_co Posted February 27, 2011 Share #10 Posted February 27, 2011 As I've mentioned before, about 25% of M bodies work fine with the C lenses. There've been a number of reports on the forum of far greater problems with the C lenses than simply non-coincidence of the rangefinder at infinity. See also Dr Puts on the matter (though his explanation of the cause differs from Leica's when the sloped-cam lenses were introduced ). Link to post Share on other sites More sharing options...
lct Posted February 27, 2011 Share #11 Posted February 27, 2011 25%? Where did you find this figure Howard? Link to post Share on other sites More sharing options...
ho_co Posted February 28, 2011 Share #12 Posted February 28, 2011 My error, lct. Thanks for the correction. Should be 75%. Just the round number given when the CL was introduced. About 25% of M's already in existence at the time wouldn't match the sloped cam. There've been a lot more produced since then, and I've got no reason to think the fraction should or should not have changed. For a while there were a number of people saying that their M8's worked fine with the C lenses, and I came to believe that Leica had changed the mounting of the rangefinder tracking assembly. But then some direct correspondence with a forum member convinced me I was wrong, so I've returned to my original position. Link to post Share on other sites More sharing options...
lct Posted February 28, 2011 Share #13 Posted February 28, 2011 Hi Howard, what i find hard to comprehend is the fact that the lens works fine with R-D1s (Bessas as well afaik) but not with 25% or truer figure of Leica bodies. Would be interesting to know how it works on Zeiss Ikons as well. Anyway do you think it is the sloping cam of the lens which explains the problems you refer to? Link to post Share on other sites More sharing options...
ho_co Posted February 28, 2011 Share #14 Posted February 28, 2011 lct, we've gone through this twice before on the forum, and I've been unable to to express it clearly enough for you. Since I seem to be the only person who accepts my explanation, it doesn't seem to make much difference. Link to post Share on other sites More sharing options...
lct Posted February 28, 2011 Share #15 Posted February 28, 2011 Sorry i don't seem to recall those posts Howard. I'll try to retrieve them. Link to post Share on other sites More sharing options...
Recommended Posts
Archived
This topic is now archived and is closed to further replies.