magosak Posted June 9, 2017 Share #1 Posted June 9, 2017 Advertisement (gone after registration) I find the focusing on all three of my 50mm lenses to be too stiff. Summilux is 3-4 years old, apo asph is perhaps a bit less (I am the second owner) and noctilux is brand new. I need to fight with these lenses to be able to properly focus. Is it the amount of glass that has to move or the viscosity of the grease that's causing this? Isn't it possible to make these lenses buttery smooth for easy focusing? 1 Quote Link to post Share on other sites More sharing options...
Advertisement Posted June 9, 2017 Posted June 9, 2017 Hi magosak, Take a look here Stiff lenses. I'm sure you'll find what you were looking for!
wattsy Posted June 9, 2017 Share #2 Posted June 9, 2017 Bit of both, I think, but the main culprit seems to be the extra lens elements that have to be moved in these modern lenses with floating elements. They do tend to loosen a little over time but I think the basic lack of buttery smoothness goes with the territory of these highly corrected optics. It's a major reason why I preferred the ergonomics of the pre-FLE 35 Summilux and continue to prefer my 35 Summicron ASPH (older version) to my 35 Summilux 'FLE'. 2 Quote Link to post Share on other sites More sharing options...
UliWer Posted June 9, 2017 Share #3 Posted June 9, 2017 Even though the lenses with floating elements may seem a little bit more stiff than other lenses - if you have to "fight with it" something is wrong (either the description or the lens). I have some lenses which are 50 to 80 years old and are "stiff", so that it would be difficult to focus them with one finger, but they move - without any fighting - when I use two. If a lens relly resists focussing it needs CLA. 3 Quote Link to post Share on other sites More sharing options...
a.noctilux Posted June 9, 2017 Share #4 Posted June 9, 2017 Normal that brand new modern Leica lenses are built that way. Partly because of floating elements and short focus throw. I had Summilux 50 asph. that was difficult to nail focus at medium distance, I replace with pre-asph Summilux. Oddly, of the three Summilux 50mm pre-asph., two with short focus throw (46mm filter/collapsible hood) and one old with long focus throw, they have silver smooth focussing. MATE (28-35-50) is another story, the focus stiffness became smoother over time. My last 28mm Summaron-M has stiff focus even without floating lens, but I hope that will be softer after some time. 1 Quote Link to post Share on other sites More sharing options...
Ko.Fe. Posted June 9, 2017 Share #5 Posted June 9, 2017 Lenses must be very modern then, indeed! I have Summarit-M 35 2.5, purchased new in 2016, the focus ring is amazingly smooth and even. Man, it is so addictive, I need to feel it, now. BTW, if old Leitz lens isn't smooth to focus it means two things. It was dropped and focus barrel became egg shaped or it needs CLA. Quote Link to post Share on other sites More sharing options...
magosak Posted June 9, 2017 Author Share #6 Posted June 9, 2017 I certainly need to use two fingers to focus and need to re-frame afterwards. The smoothest lens I have is the tiny 40mm summicron-c but this one is out of commission for now as it does not reach infinity on M10. The other m-lens I have is the 24mm summilux and that one is ok to focus. Quote Link to post Share on other sites More sharing options...
Rus Posted June 9, 2017 Share #7 Posted June 9, 2017 (edited) Advertisement (gone after registration) I had some issue with an early chrome 50mm summilux type II. It was not that the focus was not smooth when you turn the focusing ring from end to end, or any issue with stiffness or greased-up helicoid. The general resistance in the focus ring of this lens was not that much anyway. The problem was whenever I rotated the focus ring back and forth very slightly in order to fine-tune focus, it seemed to get slightly stuck, making these minor movements quite difficult. The stiffness would immediately disappear when I turned the focus ring in broad strokes with big rotations. I've always wondered if this can be remedied by re-lubricating the focus helicoid. Edited June 9, 2017 by Rus Quote Link to post Share on other sites More sharing options...
Fgcm Posted June 9, 2017 Share #8 Posted June 9, 2017 I've always wondered if this can be remedied by re-lubricating the focus helicoid. The answer is yes. Re-lubricating is the solution. Ask your dealer. It unnecessary to send the lens to Leica. Ciao Franco Quote Link to post Share on other sites More sharing options...
lct Posted June 9, 2017 Share #9 Posted June 9, 2017 (edited) Some copies of those lenses are indeed stiff but other ones are smoother, even brand new. Such are my 35/1.4 FLE and 50/2 apo for instance but my 50/1.4 asph was stiff (now butter smooth after several months at Wetzlar) and my 75/2 feels like it has no grease enough. Poor QC if you ask me. Edited June 9, 2017 by lct 2 Quote Link to post Share on other sites More sharing options...
magosak Posted June 10, 2017 Author Share #10 Posted June 10, 2017 My 50mm summilux is as stiff as it was on day one. I would like to send them all in for adjustment but dealing with customs and long delays to get them back are my major concerns. Focusing smoothness would be a major consideration in buying my next wide angle lens. 1 Quote Link to post Share on other sites More sharing options...
lct Posted June 10, 2017 Share #11 Posted June 10, 2017 [...] Focusing smoothness would be a major consideration in buying my next wide angle lens. Main culprits are floating elements and quality control as suggested above. Better try the lens in person or have it tried by your dealer if you can. Otherwise wide lenses sans floating elements are usually smooth i my experience. At least such are currently my 35/2 asph v1, 28/2 v1 & v2, 28/2.8 asph v1, 24/3.8, 21/2.8 asph and 21/3.4 asph. Same for my ZM 35/2.8 and CV 21/4 which are almost perfect from this standpoint. Quote Link to post Share on other sites More sharing options...
a911s Posted June 13, 2017 Share #12 Posted June 13, 2017 My smoothest focusing lens is a 1960 35mm Summaron 2.8 - just right. My 28mm Summicron V1 is even smoother. The 50mm Summilux Asph was never right - sold that one. Need to try modern FLE Leica lenses in person! 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! 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/273320-stiff-lenses/?do=findComment&comment=3294540'>More sharing options...
Jeff S Posted June 13, 2017 Share #13 Posted June 13, 2017 Leica doesn't currently use the same quality grease as the old Leitz stock. This was explained to me by DAG, who replaced the grease in my sticky focusing 50 Summilux ASPH with his supply of the old Leitz lubricant. Leica NJ tried to address my stiff focus issue but could not. DAG fixed it immediately and expressed his disgust with changing times. Jeff 1 Quote Link to post Share on other sites More sharing options...
jaapv Posted June 13, 2017 Share #14 Posted June 13, 2017 I have just received my Summilux 50 asph back from a complete overhaul. Although focusing feel was OK before, it returned feeling "oldfashioned" smooth. I think they might have changed the grease again. Quote Link to post Share on other sites More sharing options...
Jeff S Posted June 13, 2017 Share #15 Posted June 13, 2017 (edited) Apparently nobody has told New Jersey. I personally spoke to the tech working on my lens, and he didn't have a clue regarding a potential fix. DAG knew the problem before I sent the lens to him. Oh, and NJ did replace the grease, which did nothing. Maybe things have changed, but grease is the least of concerns with NJ service, which I'm told is undergoing an overhaul. Jeff Edited June 13, 2017 by Jeff S Quote Link to post Share on other sites More sharing options...
69xchange Posted September 12, 2023 Share #16 Posted September 12, 2023 Having this same problem with my 35mm summilux asph pre-fle. Super smooth from one end to other end but as soon as you start fine tuning to pinpoint focus, it gets “sticky”. Mainly when it’s on the close/minimum distance side. Lens has been CLA in the past but I guess it’s the type of grease and the heaviness of the optics? Quote Link to post Share on other sites More sharing options...
Infantasy Posted September 13, 2023 Share #17 Posted September 13, 2023 On 9/12/2023 at 6:12 PM, 69xchange said: Having this same problem with my 35mm summilux asph pre-fle. Super smooth from one end to other end but as soon as you start fine tuning to pinpoint focus, it gets “sticky”. Mainly when it’s on the close/minimum distance side. Lens has been CLA in the past but I guess it’s the type of grease and the heaviness of the optics? Do you mean 11874/11883? I have 11883 which have the same optic but made by brass. It also get sticky when fine tuning perhaps due to it is brass. May be 11874 which is made by aluminium would be better. 1 Quote Link to post Share on other sites More sharing options...
69xchange Posted September 13, 2023 Share #18 Posted September 13, 2023 3 hours ago, Infantasy said: Do you mean 11874/11883? I have 11883 which have the same optic but made by brass. It also get sticky when fine tuning perhaps due to it is brass. May be 11874 which is made by aluminium would be better. Mine is the silver pre fle so it’s brass too. Good to know, thanks!! Quote Link to post Share on other sites More sharing options...
BeuBu Posted September 14, 2023 Share #19 Posted September 14, 2023 I had also a very stiff focussing 50mm Noctolux. Sent it to customer care and got the answer "we cannot change it". I was very disappointed and looked for an alternative. Finally I found a small workshop closeby which is specialized in camera and lens repair in general. They knew this problem and fixed it by changing the grease plus additional grinding with diamond polisher for small money! Now it's running very smoothly and I can focus with two fingers (-: . You might have different experiences with Leica customer care ... Quote Link to post Share on other sites More sharing options...
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