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 p.17 #4 · lens repair, modification and disassembly guide thread | |
jlehet wrote:
Not sure if this is the right topic, or if I should start a new one. I'll try here first:
I'm looking for advice: I just broke my Zuiko 90/2, I think by being clumsy trying out new extension tubes I just got on EBay. I think two of the tube/rings were stuck together as I put them on, and I thought it was a single thing. Anyway, the impact is that the aperture won't open up when it's on the adapter, and the aperture ring is sticky at the f16/22 end of the range. With the adapter on, the aperture stays closed up tight. If I take it off the adapter, the aperture opens. (The adapter works with my other Zuiko lenses -- I tried that).
If I activate the lever on the back of the lens with the lens off the camera, the aperture opens and closes beautifully and smoothly. It's just the ring that is sticky, or the interface of the ring and some other mechanism I guess. Another symptom seems to be that the button that is connected to the aperture mechanism (of the two silver buttons that depress to attach/detach the lens, one of them is just a latch, and the other is connected to the aperture mechanism) -- this one aperture button seems to stick out farther than I remember, though I can't see why that would be the case. That button, on other Zuikos, will close the aperture to the setting on the ring. On my 90/2, pressing that button closes the aperture all the way.
I took the silver flange off the back of the lens and looked at the mechanism inside of that (which has the silver latch buttons in it). I don't have another one to compare, but it seems perfect. Even with that off the aperture ring doesn't want to turn all the way. I've spent a lot of time looking at the way all the mechanism works from what I can see inside the barrel, and I can't see any problem. Whatever it is, it is deeper in the lens I'm afraid.
So I wonder if there is advice -- a good place to send an old Zuiko for repair, or encouragement to open it up a bit more. I'm definitely afraid of going in another level and having stuff fly apart and have no idea how to get it back together again, but the flange removal was not scary once I did it.
I'm generally not afraid to fix broken things and use tiny screwdrivers; I've done a lot of Macintosh repair for friends and family over the years, iphone screens, iPods, etc, in the past, when everything was a bit more fixable from Apple. However this lens is (was) worth $900 or so, and I love it. I'd be happy to pay for a good repair rather than risking it.
Optically the lens is perfect, and it is my favorite lens right now, I think.
Thanks for any help!
John Lehet...Show more →
it sounds like something in the aperture ring or linkage probably got bent so that it is sticking or not moving correctly. do you know what part of the lens hit when it fell? just from your description without looking at it myself i have no idea where exactly the issues is. it's possible pictures would help, but maybe not (it's been a while since i opened up an OM lens).
unfortunately i don't have a good recommendation for repairs for you (i believe there are people who specialize in OMs though). there are a few places you can send that i know of, but they're expensive. if there are any local camera shops with a lot of used manual focus lenses they might have somebody with experience in repairs.
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