mirekti Posted February 6, 2014 Author Share #41 Â Posted February 6, 2014 Advertisement (gone after registration) I have no clue what "slot" you are talking about. The only "slot" is in the second photo. Â Â It could be the one straight above f11 mark on the left side. Link to post Share on other sites More sharing options...
Advertisement Posted February 6, 2014 Posted February 6, 2014 Hi mirekti, Take a look here Metal part scratched/peeled off, is this normal?. I'm sure you'll find what you were looking for!
Bill W Posted February 6, 2014 Share #42 Â Posted February 6, 2014 All I can say is that when I rack my lens in and out, the helocoid looks the same as the picture I took, it is shiny brass. Link to post Share on other sites More sharing options...
250swb Posted February 6, 2014 Share #43 Â Posted February 6, 2014 Maybe if you cross reference with the OP's photo's as well as thighslapper's picture, taking regard for where the focus is set. However, if you look down on the brass helicoid from the rear of the lens the threads on the outside of the helicoid should have two opposing gaps in them. Not the slots or gaps on the inside face of the mechanism. Â Steve Link to post Share on other sites More sharing options...
Bill W Posted February 6, 2014 Share #44 Â Posted February 6, 2014 Maybe if you cross reference with the OP's photo's as well as thighslapper's picture, taking regard for where the focus is set. However, if you look down on the brass helicoid from the rear of the lens the threads on the outside of the helicoid should have two opposing gaps in them. Not the slots or gaps on the inside face of the mechanism. Â Steve I can only say that perhaps my lens is a later or earlier producation as it does not have what you are describing. I have looked at it closely from various angles and various focusing settings. Link to post Share on other sites More sharing options...
Guest Ansel_Adams Posted February 6, 2014 Share #45  Posted February 6, 2014 Can I ask where you have this information from? Thanks in advance. I have never heard of or seen such a slot in the threads of any lens helicoil.  In almost all lenses there are slots for the guides to prevent rotation. They also provide ventilation.  Any thread with a slot will work as a Threading Tap scraping off and collecting the grease, eventually removing all of the grease.  So very interesting...  I got it from just looking at lenses (dismantled and assembled). My 35 Cron has a similar slot on both sides Link to post Share on other sites More sharing options...
TomB_tx Posted February 6, 2014 Share #46 Â Posted February 6, 2014 My 2012 50 Summicron has similar slots both sides, but my older lenses (70s-80s) do not. Could well be a change in design for lower cost production methods. Link to post Share on other sites More sharing options...
Erik Gunst Lund Posted February 6, 2014 Share #47 Â Posted February 6, 2014 Advertisement (gone after registration) I got it from just looking at lenses (dismantled and assembled). My 35 Cron has a similar slot on both sides Please post a picture of that. Thanks! Link to post Share on other sites More sharing options...
Erik Gunst Lund Posted February 6, 2014 Share #48  Posted February 6, 2014 Although it is out of focus I can see one of the slots on your lens in the first photo. Steve That slot is for assembly, and it doesn't go into the threads.  Regarding Bills post 33 Link to post Share on other sites More sharing options...
Erik Gunst Lund Posted February 6, 2014 Share #49 Â Posted February 6, 2014 Maybe if you cross reference with the OP's photo's as well as thighslapper's picture, taking regard for where the focus is set. However, if you look down on the brass helicoid from the rear of the lens the threads on the outside of the helicoid should have two opposing gaps in them. Not the slots or gaps on the inside face of the mechanism. Â Steve Could you post an image of the two gaps in the threads? Thanks! Link to post Share on other sites More sharing options...
Bill W Posted February 7, 2014 Share #50 Â Posted February 7, 2014 I can now see on my 75 Cron what some folks are talking about but they are hard to see and behind the lens mounting flange. They are simply in a different place on my helicoid. Looking straight down on the bottom of the lens you do not notice them. Link to post Share on other sites More sharing options...
Bill W Posted February 7, 2014 Share #51  Posted February 7, 2014 Here is a photo as best I can get. The gap is very narrow where this is located. 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! 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/221513-metal-part-scratchedpeeled-off-is-this-normal/?do=findComment&comment=2527416'>More sharing options...
250swb Posted February 7, 2014 Share #52 Â Posted February 7, 2014 Could you post an image of the two gaps in the threads? Thanks! Â The OP, thighslapper, and now Bill have each posted images showing the gaps in the threads of the helicoid, there are two, the other is opposite on the other side of the brass barrel. I'm sure it takes less time to look and learn than it does to issue all your orders and requests. Â Steve Link to post Share on other sites More sharing options...
mirekti Posted February 7, 2014 Author Share #53 Â Posted February 7, 2014 Here is a photo as best I can get. The gap is very narrow where this is located. Â Â I believe mine looks the same on the opposite side, it's just the nasty one is revealed in my sample, and your nasty one could be hidden. Anyhow, I'll keep the lens as it is, and don't plan on sending it for any repair/replacement. Maybe Leica should have engineered it in a way the marks were always hidden, but that's life. Â Cheers, I'm off to shooting, I'm in Hawaii after all. :-) Link to post Share on other sites More sharing options...
Erik Gunst Lund Posted February 7, 2014 Share #54 Â Posted February 7, 2014 Here is a photo as best I can get. The gap is very narrow where this is located. Â Thanks for posting the image, looks like your lens was machined very nicely Bill, at least compared to the ridicules bad lens of OP. Link to post Share on other sites More sharing options...
thighslapper Posted February 7, 2014 Share #55 Â Posted February 7, 2014 I have no clue what "slot" you are talking about. The only "slot" is in the second photo. Â The configuration of the helical elements on yours is different to mine ........ zero to infinity is only 90 degrees of travel...... the slot we are talking about is somewhere further round on the brass barrel in your lens ...... and doesn't appear in the roller actuating slot that we are viewing it through when turned to infinity..... and as is pointed out there are two opposite each other ........ you are lucky ...... if you can't see it you can't worry about it ..... Â Interestingly my 75 is way out of adjustment and needs to go back to Solms to be fiddled with ......it will be instructive to see if the offending slot has shifted position ..... Link to post Share on other sites More sharing options...
Guest Ansel_Adams Posted February 7, 2014 Share #56 Â Posted February 7, 2014 Here's a pic of the slot on a 28 Cron ASPH Â Link to post Share on other sites More sharing options...
Stein K S Posted February 8, 2014 Share #57 Â Posted February 8, 2014 My cron 50 from late 90ies, my lux 35 from late 90ies and my cron 28 from 2008 all has two slots. My cron 35 iv from late 90ies seems to have just one slot... While my orhers have non. Link to post Share on other sites More sharing options...
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