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Help with a Carl Zeiss Jena 5.8cm f/2 T Biotar
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PostPosted: Fri Mar 22, 2013 10:39 am    Post subject: Reply with quote

I recently picked up a post war version for $10, you'll not be disappointed.

good luck with the repairs
Smile

-Ben


PostPosted: Thu Jun 06, 2013 5:58 am    Post subject: Reply with quote

+1 for quotes - looks like Miles could get busy.

My version is also a 17-blade lens, but someone (sorry, can't see who just now) quoted the serial numbers as indicative of age. Mine lies within the latter end of that range. Is there a site with more information?


PostPosted: Sun Jun 09, 2013 9:03 pm    Post subject: Reply with quote

l9magen wrote:
My version is also a 17-blade lens, but someone (sorry, can't see who just now) quoted the serial numbers as indicative of age. Mine lies within the latter end of that range. Is there a site with more information?


Carl Zeiss Jena lenses date by serial number
3,000,000-3,200,000: 1945-1949
3,200,000-3,470,000: 1949-1952
3,470,000-4,000,000: 1952-1955
4,000,000-5,000,000: 1955-1958
5,000,000-6,000,000: 1958-1961
6,000,000-7,000,000: 1961-1964
7,000,000-8,000,000: 1964-1967
8,000,000-9,000,000: 1967-1970
9,000,000-10,000,000: 1970-1975


PostPosted: Sun Jun 09, 2013 9:49 pm    Post subject: Reply with quote

You can also try http://www.thelensdoctor.co.uk really reasonable prices.
He did some magical work on two of my lenses.


PostPosted: Mon Jun 10, 2013 2:21 pm    Post subject: Reply with quote

Tond,

thanks for the info. Makes mine in the 1952-55 vintage. Looking forward to using it again after some TLC (or CLA).


PostPosted: Wed Jun 12, 2013 5:21 am    Post subject: Reply with quote

Thanks for the info, Tonda! Mine is 5,3xx,xxx so it's from 58-61.


PostPosted: Sat Sep 21, 2013 6:35 am    Post subject: Reply with quote

Hi, just join the forum..

I acquired the same model as yours in M42 mount recently and been disassembly it to cleaned the oily blades..
The serial is 3113XXX which I supposed came in the same era as yours, came with so so many bubbles.. even there's 1 bubbles exposed in the front element.

In my copy the main body/housing (the part where to put filter on, is actually a single piece that hold everything else and also a helicoid) is made of aluminum not brass as yours.
afaik, brass helicoid is better than aluminum.. wonder if the version for Exakta is better in material and quality..

Anyway, in this design Zeiss use 2 screw that functioned as helicoid guides and also a stopper that may came to loose so it get frictioned with the body or the outer casing (the one with hyperfocal marks).. in your case, this might be the problem that cause the focusing ring is stiff in the middle of the range.

To fix this, you can detach the casing by unscrew 3 tiny screw and you'll see the stopper.
adjust so it won't get friction with the body or casing, put some sticky grease to hold it if you want and your done..

but if that not the case, better sent it for repair because the helicoid likely need to re-lube.
hope this can help..