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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