It almost sounds like the lens coupling pin is coming disengaged from the
camera body coupling ring. You hear the click, the lens is set to whatever
number, but the body coupling ring has slipped off and returned to the
"rest" position which may actually be f32. If it does it with 2 lenses, I
would look first at the condition of the coupling in the body, then at the
pins on those 2 lenses for misalignment problems.
John Hermanson
___________________________________
Closed 5/20 through 5/29.
Camtech, Olympus Service since 1977.
21 South Ln. Huntington NY 11743-4714
631-424-2121 http://www.zuiko.com
Free Olympus Manuals: 1-800-221-3000
___________________________________
----- Original Message -----
From: Marko Vrabec <marko.vrabec@xxxxxxxxxxxxxxxx>
To: OManiacs <olympus@xxxxxxxxxxxxxxx>
Sent: Thursday, May 18, 2000 5:10 PM
Subject: [OM] Stiff aperture ring syndrome
> Dear fellow OManiacs,
>
> I have recently got two beautifully preserved 50mm 1.2 Zuikos, which
> were reportedly used in a quality control lab of the largest Slovenian
> brewery. Apparently, the lens were never mounted on a camera and are
> spotless. Beautiful lens indeed, 50/1.2!
>
> However, both specimens have an annoying mechanical problem. Turning the
> aperture ring around and back several times produces a click inside the
> lens barrel, after which my OM4t stubbornly insists the aperture is set
> to 16, regardless of the actual setting. Besides, if the lens is focused
> at infinity, the aperture ring becomes very stiff and I cannot turn it
> beyond the value of 8. Alternately, when the lens is focused to the
> closest focusing distance, the aperture ring is very loose and easy (too
> easy) to turn.
>
> How bad is this? Should I return the lens, or is this thing repairable
> at a reasonable cost? One of the lens can be used, provided I
> occasionally "reset" the aperture forwarding mechanism by taking the
> lens off the camera and back, but the other specimen is quite unusable
> in its present condition.
>
> As a side note, there is actually a dead *flea* inside each lens, stuck
> to one of the elements. I don't believe this would degrade picture to
> any noticeable degree, but I wonder how did the fleas make it inside,
> both lenses surely look like they were never opened? Maybe an expert
> entomologist could determine whether the fleas are of Japanese pedigree
> and were thusly incorporated at the assembly line already? :-)
>
>
> Best regards,
>
> Marko Vrabec
> Kamnik, Slovenia
>
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