krisfoto Posted January 16, 2010 Share #1  Posted January 16, 2010 Advertisement (gone after registration) Hello all  I recently bought a APO-Summicron-M 75mm ASPH. On longer distances it is sharp. On objects closer then approximately 3m it is out of focus if I focus according to the rangefinder. And this by quiet a bit. Is this behavior normal?  Best regards, Kris Link to post Share on other sites More sharing options...
Advertisement Posted January 16, 2010 Posted January 16, 2010 Hi krisfoto, Take a look here APO-Summicron-M 75mm ASPH focus problem. I'm sure you'll find what you were looking for!
holgerf Posted January 16, 2010 Share #2 Â Posted January 16, 2010 No. Â Best Holger Link to post Share on other sites More sharing options...
Hacker Posted January 16, 2010 Share #3 Â Posted January 16, 2010 The 75AA has a floating element to allow accurate focusing for both near and far distances. Link to post Share on other sites More sharing options...
rob_w Posted January 16, 2010 Share #4  Posted January 16, 2010 I had a similar problem but in reverse.My 75 'cron lens is sharp at near distances but not at infinity.  See this thread: http://www.l-camera-forum.com/leica-forum/leica-m8-forum/100318-75-summicron-asph-focus-out-infinity.html  The conclusion is that the lens, and possibly the camera, need to go back for re-calibration. But since I am waiting for an M9 I decided to wait until it arrives before addressing the problem.  Cheers  Robert Link to post Share on other sites More sharing options...
krisfoto Posted January 17, 2010 Author Share #5 Â Posted January 17, 2010 Many thanks for your helpful replies. So it is going back to Leica.... Â Best regards, Kris Link to post Share on other sites More sharing options...
marknorton Posted January 18, 2010 Share #6 Â Posted January 18, 2010 The 75AA has a floating element to allow accurate focusing for both near and far distances. Â ... but all too often, it doesn't because of Leica's inability to set the lens up correctly. Â Floating elements may confer a theoretical design advantage which is compromised by the complexity of the mount. That's why I prefer the 90/2 to the 75/2. Link to post Share on other sites More sharing options...
UliWer Posted January 18, 2010 Share #7  Posted January 18, 2010 Advertisement (gone after registration) ... but all too often, it doesn't because of Leica's inability to set the lens up correctly. Floating elements may confer a theoretical design advantage which is compromised by the complexity of the mount. That's why I prefer the 90/2 to the 75/2.  Well, my 75-mm Apo-Asph sometimes showed some front focus and sometimes some back focus when I tested it on a focussing chart. This strange behavior of the lens puzzled me, so I tried again, concentrating on the target, avoiding to use bifocal glasses and using a magnifier. What happened? Oh wonder: it was spot on.  Yes, all too often Leica lenses are quite demanding to users' ability to set up the lens correctly. Link to post Share on other sites More sharing options...
krisfoto Posted January 26, 2010 Author Share #8 Â Posted January 26, 2010 Absolutely cool! My 75mm Summicron and M9 are back from Leica and it is at least down to 0.9m spot on now! According to repairs the 75mm and the camera got adjusted. Below 0.9m it is not perfect but much better (almost perfect)! It is to dark to test at long range, but I hope that's still ok. Â Best regards, Kris Link to post Share on other sites More sharing options...
HaraldL Posted January 27, 2010 Share #9  Posted January 27, 2010 Absolutely cool! My 75mm Summicron and M9 are back from Leica and it is at least down to 0.9m spot on now!According to repairs the 75mm and the camera got adjusted. Below 0.9m it is not perfect but much better (almost perfect)! It is to dark to test at long range, but I hope that's still ok.  Best regards, Kris  Having the same problems with m9 and 75 summicron. So readjustment seems reasonable. However, having read that readjusment involves as well the rangefinder mechanism as the lens, would it not be necessary to send all your lenses to Solms??  Harald Link to post Share on other sites More sharing options...
krisfoto Posted January 28, 2010 Author Share #10 Â Posted January 28, 2010 I still haven't been able to check at longer distances. Maybe the coming weekend... Â When I got my M9 I had only a 21mm Elmarit ASPH. I guess this focal length is quiet forgiving if the rangefinder is somewhat off. Â With the 75mm Summicron ASPH I got a 28mm Summicron too. I checked this today. It is ok. I also realised that even at close distances at 1:2.0 it doesn't matter 'a lot' if I do not focus absolutely exact. One mm to the wider side isn't to bad either. Â The 75mm seems to be a different matter (as it's to expect): Just a little bit off and a sharp picture is gone. I would not say that it is very difficult to focus, someone has only to be aware that focusing has to be very precise. Â If I would have a fast 50mm or even already a 35mm Summilux I might have detected the problems earlier. Â Kris Link to post Share on other sites More sharing options...
krisfoto Posted January 28, 2010 Author Share #11 Â Posted January 28, 2010 @Harald: I do not expect that it always depends on the lens AND the rangefinder. It was just with my M9 the case. Link to post Share on other sites More sharing options...
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