Only a few dozen times. :-0
___________________________________
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 again, again. My guess is that you've never seen this particular
> malady before, eh?
>
> Chuck Norcutt
>
> John Hermanson wrote:
>
>
>>excellent!
>>
>>___________________________________
>>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 for the help. The problem is fixed. The lens must have been
>>>repaired and mis-assembled some time before I got it and apparently I've
>>>never tried to use it until recently or, if I did, never attempted to
>>>set it wider than f/5.6.
>>>
>>>The problem was that the diaphragm stop down lever driven by the camera
>>>(CE1049) which is supposed to fit into the wider of two notches in
>>>CE1584 was on the outside of the notch and not inside the notch. The
>>>aperture control pin (CE1573) also fits into a notch in CE1584 but into
>>>the smaller of the two side-by-side notches. It was properly in the
>>>small notch but, since the stop down lever was outside of its own notch
>>>in CE1584, when the aperture control pin would cause CE1584 to rotate
>>>CE1584 would run into and jam against the misplaced stop down lever
>>>before completing its full travel.
>>>
>>>It took removing the front lens assembly as you suggested to see what
>>>the problem was but the fix had to be implemented from the back by
>>>removing the mount so the stop down lever could be lifted and inserted
>>>into the notch in CE1584.
>>>
>>>Add "mis-assembled 28/2.8" to your list of symptoms and fix file.
>>>
>>>I think this may be the first time I've ever "easily" removed a thread
>>>locked lens assembly with a little bit of acetone.
>>>
>>>Thanks again for the help.
>>>
>>>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
>>>>>
>>>>>
>>>>>==============================================
>>>>>List usage info: http://www.zuikoholic.com
>>>>>List nannies: olympusadmin@xxxxxxxxxx
>>>>>==============================================
>>>>>
>>>>>
>>>>
>>>>
>>>>
>>>>==============================================
>>>>List usage info: http://www.zuikoholic.com
>>>>List nannies: olympusadmin@xxxxxxxxxx
>>>>==============================================
>>>>
>>>>
>>>
>>>
>>>
>>>==============================================
>>>List usage info: http://www.zuikoholic.com
>>>List nannies: olympusadmin@xxxxxxxxxx
>>>==============================================
>>>
>>>
>>
>>
>>
>>==============================================
>>List usage info: http://www.zuikoholic.com
>>List nannies: olympusadmin@xxxxxxxxxx
>>==============================================
>>
>>
>
>
>
> ==============================================
> List usage info: http://www.zuikoholic.com
> List nannies: olympusadmin@xxxxxxxxxx
> ==============================================
>
>
==============================================
List usage info: http://www.zuikoholic.com
List nannies: olympusadmin@xxxxxxxxxx
==============================================
|