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Black CZJ Tessar 2.8/50 black diaphragm removal
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PostPosted: Sat Jul 03, 2010 5:16 am    Post subject: Black CZJ Tessar 2.8/50 black diaphragm removal Reply with quote

I have two black CZJ Tessar 2.8/50 lenses, both of which have stuck diaphragms.

I have tried to dismantle both but can't get to the diaphragm. I've successfully dismantled the diaphragm mechanism on a number of other lenses (various Takumars, Vivitars mainly) before, so am a bit stumped by the Tessar.

I have removed the optical block from the body, and am left with the following:

[img]http://www.flickr.com/photos/51717450@N04/4756274359[/img]
[img]http://www.flickr.com/photos/51717450@N04/4756274273[/img]

I've tried the following:
- unscrewing the name ring on the front of the block (as has worked for me in the past with a 'zebra' style tessar and I can't shift it.
- unscrewing the helicoid from the name/filter ring
- removing the rear element (it came out, but I couldn't see any way of doing much else)

I'm now at a bit of a loss. I've asked google and searched on the forums and can't find anything specific, so any pointers or guidance would be appreciated. [/img]


PostPosted: Sat Jul 03, 2010 5:18 am    Post subject: Second attempt with the pictures Reply with quote

[img]http://www.flickr.com/photos/51717450@N04/4756274273/[/img]
[img]http://www.flickr.com/photos/51717450@N04/4756274359/[/img]


PostPosted: Sat Jul 03, 2010 6:03 am    Post subject: Re: Second attempt with the pictures Reply with quote

GrahamW wrote:

http://www.flickr.com/photos/51717450@N04/4756274273/
http://www.flickr.com/photos/51717450@N04/4756274359/

I fixed mine successfully by following the link below:
http://oomz.net/tessar/