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Question regarding repairing Tessar 50mm f/2.8 - w/photos
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PostPosted: Sat Aug 14, 2010 3:24 am    Post subject: Question regarding repairing Tessar 50mm f/2.8 - w/photos Reply with quote
Hello all.

I recently purchased several MF lenses on eBay, one of which arrived with the focus ring firmly jammed. Having some small luck in the past repairing MF lenses I've given this one a shot... I am, however, now stuck.

I figure that the most likely culprit is old grease but either way I figured I'd have to disassemble down to beneath the focus ring to tell. The lens doesn't appear to be the same as other Tessar 50mm f/2.8's where there are disassembly guides - there are no screws on the rear mount and the focus ring has a leathery-looking plastic piece in place.

I can't seem to get the img tags to work so I'm linking photos Sad

...oook. now the second half of the post has converted into a link going nowhere. Or is it just me? Sad

The lens:

http://farm5.static.flickr.com/4080/4889376447_30d1153833_b.jpg

Rear:
http://farm5.static.flickr.com/4098/4889973098_42bc17da9d_b.jpg

How far I've gotten:
http://farm5.static.flickr.com/4081/4889377657_6d498a41c6_b.jpg

http://farm5.static.flickr.com/4094/4889971964_9934049407_b.jpg



Looking at http://rick_oleson.tripod.com/index-81.html... if the design is the same it seems that I need to remove one of the rings from the rear. Try as I might they won't budge, though.

So - any idea where to go from here?! The focus ring is firmly jammed at 0.8m though I can get it to go to MFD and back to 0.8 with a large amount of effort.

Any advice very much appreciated.


PostPosted: Sat Aug 14, 2010 6:00 am    Post subject: Re: Question regarding repairing Tessar 50mm f/2.8 - w/photo Reply with quote
creativelies wrote:
Hello all.

I recently purchased several MF lenses on eBay, one of which arrived with the focus ring firmly jammed. Having some small luck in the past repairing MF lenses I've given this one a shot... I am, however, now stuck.

I figure that the most likely culprit is old grease but either way I figured I'd have to disassemble down to beneath the focus ring to tell. The lens doesn't appear to be the same as other Tessar 50mm f/2.8's where there are disassembly guides - there are no screws on the rear mount and the focus ring has a leathery-looking plastic piece in place.

I can't seem to get the img tags to work so I'm linking photos Sad

...oook. now the second half of the post has converted into a link going nowhere. Or is it just me? Sad

The lens:



Rear:

How far I've gotten:






Looking at http://rick_oleson.tripod.com/index-81.html ... if the design is the same it seems that I need to remove one of the rings from the rear. Try as I might they won't budge, though.

So - any idea where to go from here?! The focus ring is firmly jammed at 0.8m though I can get it to go to MFD and back to 0.8 with a large amount of effort.

Any advice very much appreciated.


First posts are not allowed to contain links - spam prevention. Link is now OK- space needed after html.


PostPosted: Sat Aug 14, 2010 6:51 am    Post subject: Reply with quote
Shot in the dark here, but does the rear section of the lens just unscrew?


PostPosted: Sun Aug 15, 2010 5:09 am    Post subject: Re: Question regarding repairing Tessar 50mm f/2.8 - w/photo Reply with quote
sichko wrote:


First posts are not allowed to contain links - spam prevention. Link is now OK- space needed after html.


Ah, ok - thanks Smile


PostPosted: Sun Aug 15, 2010 5:10 am    Post subject: Reply with quote
martyn_bannister wrote:
Shot in the dark here, but does the rear section of the lens just unscrew?


Good idea - I gave it a shot by turning clockwise and no luck there... can't get enough purchase to try counter-clockwise with what I have. I tried some small round rubber pieces + pushing in quite hard but it still slipped.

No dice Sad


PostPosted: Sun Aug 15, 2010 6:29 am    Post subject: Reply with quote
creativelies wrote:
martyn_bannister wrote:
Shot in the dark here, but does the rear section of the lens just unscrew?


Good idea - I gave it a shot by turning clockwise and no luck there... can't get enough purchase to try counter-clockwise with what I have. I tried some small round rubber pieces + pushing in quite hard but it still slipped.

No dice Sad


Sorry, I should have said, I mean the outer part of the rear section. Can you just grab it in your hand and unscrew it counter-clockwise?[/b]


PostPosted: Sun Aug 15, 2010 11:43 am    Post subject: Reply with quote
martyn_bannister wrote:
creativelies wrote:
martyn_bannister wrote:
Shot in the dark here, but does the rear section of the lens just unscrew?


Good idea - I gave it a shot by turning clockwise and no luck there... can't get enough purchase to try counter-clockwise with what I have. I tried some small round rubber pieces + pushing in quite hard but it still slipped.

No dice Sad


Sorry, I should have said, I mean the outer part of the rear section. Can you just grab it in your hand and unscrew it counter-clockwise?[/b]


THANK YOU.

Sorted! Didn't think of twisting that part. The rear part is exposed now and it looks as though I should be able to get the rest of the way without too much trouble. Now I just have to find what on earth I did with my screwdrivers...

Thanks again Very Happy


PostPosted: Mon Aug 16, 2010 6:56 pm    Post subject: Reply with quote
http://forum.mflenses.com/how-to-tessar-disassembly-t30506.html

i posted a thread disassembling that kind of tessar, hope it helps


PostPosted: Tue Aug 17, 2010 6:11 am    Post subject: Reply with quote
WolverineX wrote:
http://forum.mflenses.com/how-to-tessar-disassembly-t30506.html

i posted a thread disassembling that kind of tessar, hope it helps


It was your thread I saw that led to my post. Thanks very much for sharing it. I couldn't find it again to give you credit, but do so now Smile


PostPosted: Tue Aug 17, 2010 5:42 pm    Post subject: Reply with quote
martyn_bannister wrote:
WolverineX wrote:
http://forum.mflenses.com/how-to-tessar-disassembly-t30506.html

i posted a thread disassembling that kind of tessar, hope it helps


It was your thread I saw that led to my post. Thanks very much for sharing it. I couldn't find it again to give you credit, but do so now Smile


thanx. i'm happy for my experience to help others, that's why i make threads in this section Very Happy
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