I recently bought a Pentax KA 50mm f/1.7. The aperture ring wouldn't go any smaller than f/8. So I opened it up and on removal of the aperture ring, out popped the bearing, a spring and a couple of metal piece. One of them was the stop for the A setting and I stuck it back on with epoxy.
I assembled the lens without the bearing, spring (this is not the spring for the bearing - that spring is still on the lens) and the other metal piece to check whether the ring would move - it does steplessly, as expected - without the bearing. But the metering on the A setting is incorrect - I get the reading for the smallest aperture f/22 instead. I think this may have to do with the metal piece shown below (faintly circled).
Any idea where this piece goes?
Also, when I tried to pick up the spring, it jumped and is missing.
Does a spring go under the A button? The button works fine even without the spring - only problem is that it stays depressed on manual aperture settings once it clears the metal stop underneath.
Also, how do I get the bearing to stay while reassembling the ring back on?
Lens -
TIA!
Last edited by jhaji; 07-16-2009 at 11:46 AM.
Reason: Replace with smaller image