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Velocity
Tinkerer
Username: Velocity
Post Number: 1
Registered: 03-2009
Rating: N/A
Votes: 0 (Vote!) | | Posted on Friday, March 13, 2009 - 05:38 pm: | 
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Greetings all, I've read over some random posts on this forum a few times but this is the first time I'm posting with an issue of my own.
I recently bought a very cheap Fuji lens with a weird issue. First, the aperture and focal rings are "uncalibrated" - that is, the aperture ring has a marked range from 1.7 to 22, but when the aperture is wide open (confirmed visually by looking at the diaphram) the indicator mark that rests between thw focal and aperture rings indicates an aperture of 2.8. The aperture ring can also be rotated well beyond 22.
However, the issue is not just that the aperture ring is offset; the focal ring is offset, too. But even worse, then the focal ring is rotated, the aperture diaphram rotates with it and facilitates a closing of the blades, even if I hold the aperture ring steady. A visual inspection of the lens shows that there seems to be a screw missing from along the focal ring, but there are two other screws that are in-tact and firmly secured (although given the size of the gaping screw hole, it would seem that the missing screw was a bit larger than the other two).
Does anyone have any ideas as to what the issue is and what can be done to fix it? If it's beyond repair, I'll just dissect it as a learning experience... I'd originally bought it thinking that it was the M42-mount Fujinon 35mm f/1.9, but instead it turned out to be a TV lens. The mount seems as if it'd fit M42, but it won't screw into the mount nicely (and I won't force it and risk damaging the mount). I'm afraid that it may be a T-mount or C-mount instead (assuming a C-mount has threads).
I can provide pictures if it'd help with anything; just let me know. Thanks for any advice!  |
Zcream
Tinkerer
Username: Zcream
Post Number: 8
Registered: 04-2008
Rating: N/A
Votes: 0 (Vote!) | | Posted on Thursday, August 26, 2010 - 03:30 am: |
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Hmm. I am trying to repair a Cosmicar 25,, f1.9 tv lens as well. I took out all the screws - you need a small jewellers screwdriver. Unfortunately my focus helicoid refuses to come off. |
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