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01-13-2011, 04:00 AM   #1
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Confused but proud owner of the Carl Zeiss Jena 200mm f/2.8

Hi guys,

My lovely Carl Zeiss Jena 200mm f/2.8 M42 just arrived today from Poland. After some minor surgery to fix a slipped aperture ring control rod, as well as an internal light shield, it's working good as new and ready to shoot. However, the information I got for this lens indicated a filter size of 77mm, and the filter I bought for it doesn't quite fit, being a hair too small. I tried another 77mm filter and had the same result. I know older MF lenses had different filter sizes, so am I missing something here? This is my first MF lens, so I'm not quite experienced in this area, but I really want to protect my investment. Thanks.

01-13-2011, 05:19 AM   #2
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Welcome here.
If the filter ring has been tampered with or damaged, then that may explain the discrepancy.
Well, hope you enjoy shooting with that special glassware.
01-13-2011, 10:18 AM   #3
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Does it say 77 mm on the lens?
01-13-2011, 10:41 AM   #4
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Welcome to the forum Rattus ! I guess 77mm is just fine as you can see here:



I am guessing: Your filter thread is not perfect, but you don't see this right away. If you need to get it perfectly round again, it is quite easy to remove the outer barrel from the lens and then, having a hollow metal tube, work with it.
Good luck,
Georg


Last edited by georgweb; 01-13-2011 at 10:51 AM.
01-13-2011, 04:14 PM   #5
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It doesn't say the filter size on the lens. But both the filters I have (which are admittedly cheap) both seem slightly too small in diameter and don't even catch the threads. I can't see any damage to the barrel at all, so I'm still pretty confused. Georg, what filter is that you're using? What brand? Thanks
01-13-2011, 05:58 PM   #6
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Oh, I didn't see your filter was in fact too small, not too big. As you can see on my pic, there is an ordinary 77mm filter attached to the lens (Hoya HMC). The lens sure has 77mm thread, here is a reference as a confirmation.

AFAIR there are some filters which are rather loose in the lens' thread, and these are often the cheaper build filters. Nevertheless, even those will catch firmly on some point in the last revolution. If not, you could try the following: Put some very thin adhesive tape around the filter. The tape would be of the sort you are using for isolating wires and stuff (non-webbing). Then, try screwing the filter on again. If still loose, apply more tape. If you carefully screw the filter in with the right amount of tape, it should sit firmly.


Bowing to the master: M42 CZJ Sonnar 2.8/200 on K100D

Best of luck, Georg

Last edited by georgweb; 01-13-2011 at 06:07 PM.
01-13-2011, 06:03 PM   #7
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You could try your filters on another lens, or maybe go to a camera shop and attempt to buy a filter that fits (possibly just as a test without buying anything).
01-14-2011, 04:16 AM   #8
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QuoteOriginally posted by sewebster Quote
You could try your filters on another lens, or maybe go to a camera shop and attempt to buy a filter that fits (possibly just as a test without buying anything).
I've already tried this filter on another lens and it's fine, as well as tried another (admittedly cheap) 77mm filter from another lens and it had the same problem, as if the CZJ barrel end is just a little bigger than contemporary lenses.

01-14-2011, 08:29 AM   #9
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Maybe try using plumber's teflon tape to make the filter diameter larger a bit, it will not involve any adhesive.
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