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[OM] Vivitar 75-205mm Lens with potential problem.

Subject: [OM] Vivitar 75-205mm Lens with potential problem.
From: "Jon Mitchell" <jon@xxxxxxxxxxxxxx>
Date: Mon, 7 Oct 2002 12:17:14 +0100
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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