JPizzzle Posted February 28, 2012 Share #1  Posted February 28, 2012 Advertisement (gone after registration) Hey all, So this might be considered normal, but wanted to get opinions. I recently received my 50 lux asph and m9 back from leica service for a cla and calibration. I noticed that when the aperture ring is extended to the widest open f stop-1.4-it can go a little further-same at f16. Wide open I can also see the blades retract slightly more inward towards the barrel. It does not hold however, but wants to go back into the 1.4 stop if this makes sense. I always assumed that the blades are supposed to be fully retracted at 1.4-but I dunno maybe it doesn't matter as long as it produces the correct diameter.  Anyway, In comparison to my other lenses where it feels like you hit a wall at the stop, this has a very slight more space after. I have not experienced this in my non-leica lenses and this is my only leica lens-so can't compare it. In trying to research this I only found this thread:  Excess play in Summicron lens? - Photo.net Leica and Rangefinders Forum  Anyone know if this is normal? Thanks,  JP Link to post Share on other sites More sharing options...
Advertisement Posted February 28, 2012 Posted February 28, 2012 Hi JPizzzle, Take a look here Concern over my lux. I'm sure you'll find what you were looking for!
IWC Doppel Posted February 28, 2012 Share #2 Â Posted February 28, 2012 I haven't got a 50, lux, sorry but all bar one of my Leica lenses do exactly the same, some have commented on this before. Â If I hold open it does not affect the light sufficiently to read any differently, I wouldn't worry as I suspect this is within the design. Link to post Share on other sites More sharing options...
StephenPatterson Posted February 28, 2012 Share #3 Â Posted February 28, 2012 It's normal. My 50 Summilux ASPH is exactly the same... Link to post Share on other sites More sharing options...
JPizzzle Posted February 28, 2012 Author Share #4 Â Posted February 28, 2012 Thx IWC & Stephen!-I can't find much info on it except for that thread. It also does not impact my light readings. As I mentioned, I just got it back from leica-so it would be strange for it to be unintentional-but who knows.. Happy to see it's not just me. Funny how these leica products make us crazy-I guess that's what happens when you drop that kind of $$ Link to post Share on other sites More sharing options...
StephenPatterson Posted February 28, 2012 Share #5 Â Posted February 28, 2012 Funny how these leica products make us crazy-I guess that's what happens when you drop that kind of $$ Â That's what the forum is for!!! I mean, who else can we talk to about this stuff??? (certainly not our wives!!!) Link to post Share on other sites More sharing options...
JPizzzle Posted February 28, 2012 Author Share #6 Â Posted February 28, 2012 That's what the forum is for!!! I mean, who else can we talk to about this stuff??? (certainly not our wives!!!) Â Hah, no wife yet, but the girlfriend has probably learned more about leica then she ever wanted to know -although she doesn't complain about those beautiful portraits! Â Also, this forum has certainly been welcoming and kind hearted. I feel that many other forums are filled with negativity and insults, but have not experienced that in my short time here Link to post Share on other sites More sharing options...
LotharZhou Posted February 28, 2012 Share #7 Â Posted February 28, 2012 Advertisement (gone after registration) It's perfectly normal, almost all my leica lenses do the same, funny none of my zeiss lenses have this issue. Link to post Share on other sites More sharing options...
Double Negative Posted February 28, 2012 Share #8 Â Posted February 28, 2012 A lot of lenses do this, no worries. Link to post Share on other sites More sharing options...
wda Posted February 28, 2012 Share #9 Â Posted February 28, 2012 I am afraid I will buck the trend. Just checked my version which has none of the symptoms described. Nor does it have any of the focusing stiffness experienced by some owners. Not complaining, but offer the evidence to balance the reports offered so far. I am more than delighted with the lens, both mechanically and optically. Link to post Share on other sites More sharing options...
JPizzzle Posted February 28, 2012 Author Share #10 Â Posted February 28, 2012 I am afraid I will buck the trend. Just checked my version which has none of the symptoms described. Nor does it have any of the focusing stiffness experienced by some owners. Not complaining, but offer the evidence to balance the reports offered so far. I am more than delighted with the lens, both mechanically and optically. Â Thx Wda, from what I could gather it seems that not all of the lenses experience this, but perhaps most do.?.? It seems that it's considered normal from what I could gather. Link to post Share on other sites More sharing options...
Double Negative Posted February 29, 2012 Share #11 Â Posted February 29, 2012 "Focusing stiffness" has a lot of variables to it, so unless you're comparing two identical new lenses from the same manufacturer, any comparison is probably a wasted effort. Temperature has a direct effect as colder lenses will be stiffer than warmer ones. New lenses will likely also be stiffer than older ones. Some lenses have more mechanical complexity (e.g. FLE) than others. Finally, what one person finds "stiff" might not be so for another. Link to post Share on other sites More sharing options...
mijosc Posted March 1, 2012 Share #12 Â Posted March 1, 2012 Many of my Leica lenses do this. Perfectly normal. Link to post Share on other sites More sharing options...
JPizzzle Posted March 2, 2012 Author Share #13 Â Posted March 2, 2012 It's good to see that it's a normal occurrence, and thanks to those who replied. I am curious though, do you all think that since the aperture blade can be further (although slightly) pushed into the barrel when extended beyond the widest aperture, that perhaps they are not truly at their widest aperture when not further pushed? I was always under the impression that at the widest aperture that the blades should be fully withdrawn. Â Please also understand that my knowledge on lens construction is extremely limited. Thanks, Link to post Share on other sites More sharing options...
pico Posted March 2, 2012 Share #14 Â Posted March 2, 2012 In my experience with large format lenses, those that have apertures that do not turn a bit further at each end are the ones that break first. (and some of the leaves are pressed paper!) I'm no engineer but it appears to be some insurance from over torquing, ham-fisted handling. But they all snap right back to the correct, intended aperture. Â You are good to go. Link to post Share on other sites More sharing options...
Recommended Posts
Archived
This topic is now archived and is closed to further replies.