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Yet Another Broken Tessar: Can't remove aperture selector?
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PostPosted: Sat Jun 16, 2012 7:05 am    Post subject: Yet Another Broken Tessar: Can't remove aperture selector? Reply with quote
My example is the tiny 1950's (serial 4716620) f2.8 50m

Everything was stuck solid, so i followed the usually guides,

http://oomz.net/tessar/
http://rick_oleson.tripod.com/index-81.html

But I find I'm still stuck getting the aperture out so I can clean the control blades etc etc The back and front name plate has been no worries (after I cut a plug up for the name plate)

Sorry if this has been asked numerous times, the search function within this site is a little hit and miss, and I've run out of queries to pump into google Sad

Attached is as far as I have come in disassemble









The red white balance is to help express the hell and frustration i find myself in Razz. Just how do i get the rest of the body apart to service the aperture blades and control?

Any hints of shoves in the right direction will be greeted with joys and exuberance!

Regards
Dan

Last edited by tromboads on Sun Jun 17, 2012 10:36 pm; edited 1 time in total


PostPosted: Sat Jun 16, 2012 12:08 pm    Post subject: Reply with quote
I have a lens that looks similar, the aperture cup(with the slots) is held in by a ring, which in turn is held in by a grub screw(s).
Loosen the grub screw(s), the aperture cup is turned by a screw with a long head which slots into the aperture ring, so I think the aperture ring is the next thing to remove.


PostPosted: Sat Jun 16, 2012 1:17 pm    Post subject: Reply with quote
hmmm curious.

there are no screw heads exposed in my example so I feel kinda stuck. I nearly feel as if there is another "name plate" type body thread which needs to be removed. I can poke and prove the apature housing, and could probably force it out but that still leaves the control unit attached.

sorry when I say control unit I mean the circular aperture selector and the rail it must move on, which ultimately is what I'm trying to get at. Sad


PostPosted: Sat Jun 16, 2012 3:31 pm    Post subject: Reply with quote
I really wonder if it's worth the trouble for a fairly slow, average lens.


PostPosted: Sun Jun 17, 2012 12:01 am    Post subject: Reply with quote
Oh its only trouble because I don't know what I'm doing :p I feel too close to want to waste it now.

And if some one has been where I've been, it wont be trouble for much longer ;p

As for its worth, yes I don't imagine this to be a magical key, it does seems a shame to waste an otherwise functional lens that, through no fault of its own just had all its lube dried out Razz


PostPosted: Sun Jun 17, 2012 11:08 pm    Post subject: Reply with quote
martinsmith99 wrote:
I really wonder if it's worth the trouble for a fairly slow, average lens.


I have to partly disagree with you. Yes it's somewhat slow, but all Tessar are f2.8 or slower. It's by design. I find it optically very good lens with delicious bokeh. I would say it's better than average. I enjoy shooting with it very much:

http://oldlenses.blogspot.ca/2012/03/carl-zeiss-jena-tessar-50mm-f28-sample.html
http://oldlenses.blogspot.com.au/2012/05/carl-zeiss-jena-tessar-50mm-f28-another.html
http://oldlenses.blogspot.ca/2012/05/photoessay-with-carl-zeiss-jena-tessar.html


PostPosted: Sun Jun 17, 2012 11:45 pm    Post subject: Reply with quote
Lightshow wrote:
I have a lens that looks similar, the aperture cup(with the slots) is held in by a ring, which in turn is held in by a grub screw(s).
Loosen the grub screw(s), the aperture cup is turned by a screw with a long head which slots into the aperture ring, so I think the aperture ring is the next thing to remove.



Turning the lens face down i can see what apears to be the grub screw that holds the internal aperture ring down against the rear element. I cant access it tho (thread points 90 degrees out of the body) along the rail for it to move, because of the pre-set selector being in the road. I must have to remove that first, but again I'm at an end of my understanding Sad


PostPosted: Thu Jun 21, 2012 1:52 pm    Post subject: Reply with quote
Gummiebear wrote:
martinsmith99 wrote:
I really wonder if it's worth the trouble for a fairly slow, average lens.


I have to partly disagree with you. Yes it's somewhat slow, but all Tessar are f2.8 or slower. It's by design. I find it optically very good lens with delicious bokeh. I would say it's better than average. I enjoy shooting with it very much:

http://oldlenses.blogspot.ca/2012/03/carl-zeiss-jena-tessar-50mm-f28-sample.html
http://oldlenses.blogspot.com.au/2012/05/carl-zeiss-jena-tessar-50mm-f28-another.html
http://oldlenses.blogspot.ca/2012/05/photoessay-with-carl-zeiss-jena-tessar.html


i hope too to! providing i can get it opened Sad


#UPDATE.

So i left it in a tub of kero overnight, next morning still nothing. left it another night Smooooooooooooth as can be. Still. the blades now have come loose and are wondering over the rear element. Rolling Eyes Ironic that now its in a workable position I'm still stuck needing to get under them still to put them back together.

Next time someone tries this, use some tape to hold the ring down, leave it in kero over night then put it back together and shoot with the dam thing.

"sigh"


PostPosted: Wed Jun 27, 2012 6:07 am    Post subject: Reply with quote
So no one can remember how to remove the aperture selector so I can get at the aperture ring?

This lens thus far literally survived the cold war and a depression or 3 Razz It would seem be a shame for its death to be due to simple ignorance. Sad


PostPosted: Thu Oct 11, 2012 3:57 pm    Post subject: Reply with quote
Quote:
So no one can remember how to remove the aperture selector

Did you ever find you how to remove it?
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