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02-20-2010, 12:08 PM   #1
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Busted Biotar?

I recently acquired a CZJ 58/2 Biotar that initially had an aperture limiting ring that was very stiff to turn. No big deal -- I would use it wide open 90% of the time anyway. I took it out of my bag today and the ring won't turn at all. What's worse is that it is set with a range of f2-4 and when I turn the focus ring, the aperture opens and closes itself within that range as it pleases. I can't get the limiting ring to turn back to the "f2 and f2 only" position -- the bugger won't move. Any suggestions?



02-20-2010, 12:21 PM   #2
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Sorry I can't be of more help but here's a disassembly guide: Carl Zeiss Biotar f2 58mm pre-set, M42 mount
02-20-2010, 12:47 PM   #3
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I'm guessing it only needs take apart & adjustment. Probably somethings come loose is binding the aperture adjustment ring and catching on focus ring.

http://www.workingpsychology.com/diversions/Zeiss%2058mm%20Biotar.pdf
02-20-2010, 06:40 PM   #4
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I was afraid of that. Looks like I'll be surfing ebay for a lens spanner.

02-23-2010, 05:36 PM   #5
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Can anyone recommend a particuler type of lens spanner (so that I don't waste my $)? It won't be a one-use purchase necessarily as I have a Helios with a stiff focusing ring that I would probably practice on.

Thanks!
02-24-2010, 04:33 AM   #6
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http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=360227985077

http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=360199088186
02-24-2010, 10:04 AM   #7
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QuoteOriginally posted by geauxpez Quote
I recently acquired a CZJ 58/2 Biotar that initially had an aperture limiting ring that was very stiff to turn. No big deal -- I would use it wide open 90% of the time anyway. I took it out of my bag today and the ring won't turn at all. What's worse is that it is set with a range of f2-4 and when I turn the focus ring, the aperture opens and closes itself within that range as it pleases. I can't get the limiting ring to turn back to the "f2 and f2 only" position -- the bugger won't move. Any suggestions?

I just wanted to say, that's a beautiful piece of glass there. I hope that you can get it working right.
02-24-2010, 10:36 AM   #8
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Thanks for suggestions -- I saw those listings and what I really wanted to know was if there was anyone with experience repairing the Biotar-type lenses, whether or not there was a particular spanner that was recommended or to avoid.

Thanks!



02-24-2010, 10:39 AM   #9
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QuoteOriginally posted by little laker Quote
I just wanted to say, that's a beautiful piece of glass there. I hope that you can get it working right.
Thanks -- as much as I have enjoyed my Helios, I'm sure I will love this one. I could probably pay to have it repaired for what it would cost in the right tools for me to fix it, but I would rather turn this into a learning experience. I plan to get the proper tools soon.
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