I had exactly the same problem with that lens - sent it off for repair
and it's ok now. In my case I noticed that I was getting no DOF with
the lens (used 1000f the time on an OM-10 with colour neg film).
...Wayne
> -----Original Message-----
> From: owner-olympus@xxxxxxxxxxxxxxx
> [mailto:owner-olympus@xxxxxxxxxxxxxxx] On Behalf Of Jon Mitchell
> Sent: Monday, 7 October 2002 9:17 PM
> To: Olympus Mailing List
> Subject: [OM] Vivitar 75-205mm Lens with potential problem.
>
>
> Hi Guys,
>
> I'm after a little advice from all of you regarding the above
> lens. The specific details are :
>
> Vivitar 75-205mm; 1:3.8; MC; Macro Focusing Zoom;
> No.22205xxx; 62mm Filter Thread;
>
> (all read from the front element surround)
>
> Firstly, what I understand (may or may not be correct !):
>
> With all OM and OM Fit lenses, pressing the DOF preview
> button causes the iris to close to whatever f no the lens is set to.
>
> Now the problem ....
>
> With this presumption in mind, I now hold the lens up to the
> light (not mounted on the camera). I can see straight
> through it. No sign of an iris. Next I hold down the DOF
> Preview button and adjust the F-stop dial. From max. (f3.8)
> to min. (f22). STILL no sign of an iris.
>
> Now, this doesn't seem quite right to me. This suggests that
> whatever I set the lens to, the shot will always be taken
> with f3.8. Can someone confirm for me whether this is a
> fault, or whether I have missed something obvious here !! If
> it's a fault, I assume it wouldn't be advisable to attempt a
> repair myself ? I am pretty competent with engineering,
> especially tiny stuff, but I know little about lenses and
> their internal construction. And it's not my lens - it's my
> Dad's !! Boy am I going to be in trouble !!
>
> Anyway, any help gratefully received.
>
> Regards,
>
> Jon
>
>
>
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