Date: Mon, 20 May 2002 11:14:36 +0100
From: Chris Barrett <cpbarrett@xxxxxxxxxxxxxxx>
Subject: [OM] Not quite a Fang!
Dear Folks,
After dropping my son off in Worcester to see Star Wars on Saturday, I =
went and looked in the two local camera shops. I've taken to rummaging =
through the scrap boxes, as they are putting odd OM bits in there =
(usually 50mm lens hoods).
Nestling on top was a 50mm f/1.8. Needless to say I new something must =
be wrong with it, and sure enough it has a sticky aperture. But it was =
in otherwise excellent condition, and looked as if it had hardly been =
used. So I bought it for =A32.
Now it happens I need a good lens for a physics experiment, but without =
the aperture, so I'm not losing anything if I can't fix it.=20
I investigated the flange end, and the aperture linkages look OK. It is =
the inner aperture mechanism which is gummed up.
The question is what is the best way to get to the inner mechanism? Do I =
carry on through the back, or should I go in from the front?
All advice gratefully received.
Chris Barrett
Malvern
Hi Chris, should be an easy fix:
It's normally the stop down mechanism that gets oily or gummed up. From
flange (lensmount) end remove the three screws securing the mount &
carefully remove the mount. Carefully seperate the circular linkage &
clean. Refit, hooking on spring. Carefully refit the mount, operating
stopdown mechanism as you do so, to prevent binding. This is from memory,
e-mail me off list if you have any problems. It's fairly simple, but take
care & do on a table so you don't lose anything! If this fails maybe oil on
aperture blades.
Andy Gilbert
Exeter
Devon
England
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