| Author |
Message |
    
Mr_flibble
Tinkerer
Username: Mr_flibble
Post Number: 86
Registered: 10-2011
Rating: N/A
Votes: 0 (Vote!) | | Posted on Thursday, November 01, 2012 - 01:49 am: | 
|
I recently acquired a Xenon 50 f/1.5 in LTM.
The focus is off and loose. At minimum focus distance (set at 100cm) actual focus is about 90cm.
I want to tighten it up and collimate it properly.
Any ideas which screws I need to take out?
There's some oil on the aperture blades but that doesn't appear to be a problem at this moment. But if there's an easy way to get access to them I'd love to hear it too.
Any help appreciated.
Rick |
Mr_flibble
Tinkerer
Username: Mr_flibble
Post Number: 87
Registered: 10-2011
Rating: N/A
Votes: 0 (Vote!) | | Posted on Monday, November 05, 2012 - 04:22 am: |
|
Managed to fix the problem myself.
The Xenon is quite similar in design to the Summarit, on which one can find a little more information concerning disassembly.
The main difference is that the service openings in the focus ring on the Summarit are hidden on the Xenon. After removing the single locking screw you can unscrew the knurled ring from the rest of the focus ring (section with the tab). You can then see three opening in which to insert the pins to lock the rear lens element in place and you can unscrew the rest of the lens unit and aperture blades/ring.
The problem with mine was that my lens had been incorrectly re-assembled. And the 3 set screws that hold the entire lens unit in position were loose.
Lens now focusses correctly and no more wobble in the front section.
http://www.flibweb.nl/flibweb/cpg143/albums/userpics/10001/xenon4.jpg
Mounted on a Leica IIIc
http://www.flibweb.nl/flibweb/cpg143/albums/userpics/10001/xenon14.jpg
Test shot on R-D1
http://www.flibweb.nl/flibweb/cpg143/albums/userpics/10001/xenon08.jpg |
Br1078lum
Tinkerer
Username: Br1078lum
Post Number: 422
Registered: 11-2010
Rating: N/A
Votes: 0 (Vote!) | | Posted on Monday, November 05, 2012 - 12:31 pm: |
|
Good to hear you've got it all worked out, Rick. And that's a lovely test shot.
PF |
Mr_flibble
Tinkerer
Username: Mr_flibble
Post Number: 89
Registered: 10-2011
Rating: N/A
Votes: 0 (Vote!) | | Posted on Tuesday, November 06, 2012 - 07:12 am: |
|
Thanks,
Not sure if the glow is due to the scratched rear element or because it's a 75 year old Leitz lens. ;) |
Br1078lum
Tinkerer
Username: Br1078lum
Post Number: 423
Registered: 11-2010
Rating: N/A
Votes: 0 (Vote!) | | Posted on Tuesday, November 06, 2012 - 08:06 pm: |
|
Maybe a little bit of the scratch affecting things. But then you have a wide variation between light values in that shot, so a little glare would be expected. Kind of hard to hold the highlights without blanking everything else out.
PF |
