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

Subject: RE: [OM] Vivitar 75-205mm Lens with potential problem.
From: "Wayne Harridge" <wayneharridge@xxxxxxxxxxxxxxx>
Date: Mon, 7 Oct 2002 23:18:26 +1000
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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> 



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