Re: DR Summicron incompatabilities

[seungmin@luxmail.luxcom.com]

     Hi,
     
      Last night I took out my DR-Summicron (1449331) to try on several M 
     bodies.  It comes with older type eyes and engraved in meters only.
      Silly enough, I could not mount the lens with the eyes to any of my M 
     bodies that included M4, M2S, M3.  I realized that a little black 
     plastic thing on the back of the eyes was blocking.  I do not know 
     what the black thing is for.  I mounted the lens first without the 
     eyes and then mount the eyes.  It worked perfectly.  When I tried to 
     mount the lens with the eyes on the lens, the black plastic thing was 
     situated right next to the rewind button and blocked ritht there.
      I remember mounting the lens with the eyes long time ago.  I do not 
     remember how I did it though.  Any idea about this black plastic 
     thing?
     
     Regards,
     David

______________________________ Reply Separator _________________________________
Subject: DR Summicron incompatabilities
Author:  leica-users@mejac.palo-alto.ca.us at Internetmail
Date:    08/20/97 8:41 PM


     
I have a problem removing and putting on my DR on the M6 when focussed 
at 3'4".   My lens is #1587840  M6 is 2288xxx.  At least my mystery is 
solved for me.
     
(I am not sure about terminology.  In the following description, 
Cam-follower is the thing inside the camera, the cam is the the thing 
inside the lens.  Somebody please enlighten me on correct usage).
     
After examining my DR and M6 rather closely, I can see and feel where 
the problem is. When lens is focused at 3'4", and when I try to put on 
the lens, the cam in the lens attempts to push the cam-follower to its 
most retreated position.  But there is a stop limit on the 
cam-follower, and because of that, the bayonet flange won't touch its 
counterpart flush on the camera, and you can't turn more than a 
certain amount.
     
The reverse is true when trying to dismount with lens focused at 3'4".
     
However, once it is on, you can move to 3'4" because when mounted, the 
cam-follower just touches the "indented" part of the cam.  And also, 
when mounted, you _can_ move to the close focusing distance.  This is 
because just turning that much retracts the cam into the lens, just 
giving it enough clearance for the cam follower to retract all the way 
back into the camera, which it couldn't do while mounting.
     
Now I don't know why my M6 cam follower can't retreat all the required 
way back.  Perhaps because it is a late model, perhaps it is 
manufacturing tolerance.  But one thing I did notice was that the stop 
on the cam-follower on the M6 is different from my M3.  The one on the 
M6 is best described as looking like an off-center washer, and also 
bigger than the one on the M3.  The off-center is such that it would 
definitely allow the cam-follower to retreate less than what would be 
if the same style of stop as an M3 was used.  The stop on the M3 looks 
more like a circular, regular washer, smaller than the one on M6.
     
- -- 
S. Khai Mong           Imageware Inc, 323 N. First St, Ann Arbor, MI 48103 
Email: khai@iware.com                                Voice: (313) 994-7301 
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