Thanks for the further explanation. It will be helpful since I'm not
done nor have I even restarted. Circumstances have conspired to keep me
on other things.
Chuck Norcutt
John Hermanson wrote:
> Pin CE1573 goes through slot in CE1561 main tube. This is what prevents
> lifting of ring. End of CE1573 fits into slot of CE1548.
>
> On most other OM lenses, a forked tab would protrude through this slot
> in the main tube, and a simple shoulder screw on the diaphragm ring
> would engage that tab. Easy lift-out. By now, you are probably done, but
> I thought I'd explain anyway.
>
>
> ___________________________________
> John Hermanson
> Camtech Photo Services, Inc.
> 21 South Lane, Huntington NY 11743
> 631-424-2121 | Olympus OM Service since 1977
> http://www.zuiko.com | omtech1 AT verizon.net
>
>
> Chuck Norcutt wrote:
>
>>Thanks, John. I can see the L shape in the parts diagram but don't
>>recognize anything that I would have thought would interfere with
>>pulling the ring straight up. But I'll certainly follow your
>>instructions. I'm intrigued now to see what's actually holding it in
>>place and, of course, to see what's preventing the full range of motion.
>>I'm suspicious that the pin was simply misplaced when the lens was last
>>assembled. Perhaps it's on the wrong side of whatever mechanism it's
>>supposed to mate with. I'll soon see.
>>
>>Thanks,
>>Chuck Norcutt
>>
>>John Hermanson wrote:
>>
>>
>>>The pin on the 28 2.8 is L shaped and connects to the diaphragm control
>>>cam through a slot in the main tube. To remove the ring, you'll have to
>>>take out the 2 screws holding the pin in. Unscrewing the front lens
>>>assembly, which would expose the diaphragm mechanism, should reveal what
>>>the problem is.
>>>
>>>___________________________________
>>>John Hermanson
>>>Camtech Photo Services, Inc.
>>>21 South Lane, Huntington NY 11743
>>>631-424-2121 | Olympus OM Service since 1977
>>>http://www.zuiko.com | omtech1 AT verizon.net
>>>
>>>
>>>Chuck Norcutt wrote:
>>>
>>>
>>>
>>>>Hey, here's a real, live, nitty-gritty, on-topic OM post!
>>>>
>>>>I have a 28mm 2.8 which will not open (using the diaphragm ring) to more
>>>>than f/5.6. The diaphragm blades open fully when the DOF preview button
>>>>is not depressed but the diaphragm ring can't be rotated to either f/4
>>>>or f/2.8. It hits a hard stop at f/5.6.
>>>>
>>>>I assumed that there must be a problem with the detent ball but was
>>>>surprised when I removed the filter/detent ring and found that the
>>>>detent mechanism is fine and there is no appreciable wear on the ring.
>>>>
>>>>I tried rotating the diaphragm ring again without the detent ring and
>>>>ball installed and it still hits a hard stop at f/5.6. Then I tried to
>>>>lift off the diaphragm ring and was surprised to discover that I
>>>>couldn't. I can lift the side opposite what I'll call the diaphragm
>>>>coupling pin (CE157300 on the parts diagram) but that pin acts like it
>>>>has a hook on the end. The pin side lifts no more than 1/2mm and stops
>>>>cold just as though what I think should be a flat bladed pin has a hook
>>>>on the end and is catching on something.
>>>>
>>>>Any suggestions? If I remove the lens mount will I be able to see the
>>>>inside of the barrel and figure out what the obstruction is? I guess I
>>>>could also remove the two screws attaching the diaphragm ring to the
>>>>coupling pin but I hate to disassemble what I don't have to.
>>>>
>>>>Thanks,
>>>>Chuck Norcutt
>>>>
>>>>
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>>
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