I suggest you put a lens on the tube and set the shutter speed dial on
"B". Open the back of the camera and hold the shutter open while you
attach the tube/lens combo. With the back open you should be able to
observe the coupling (or failure thereof) between the tube's coupling
lever and the meter arm. You may also want to compare with another lens
or two without the tube such that you see how things are supposed to be
aligned. You'll soon figure out what's bent and how to correct it.
Chuck Norcutt
priit@xxxxxxxxx wrote:
> I've just got a telescopic auto tube by mail order, and while checking out
> the basic functions, discovered an annoying problem. It does not like to
> couple with my OM-4T.
>
> The problem seems to be that the meter coupling lever does not pass on the
> information about the aperture, while the other lever that closes down the
> aperture appears to work correctly.
>
> I did some testing and found that while it does not work when mounted
> directly on the body, when I put an auto extension tube in between
> everything works. So it does couple with a different OM mount, just not
> with the body. Unfortunately I don't have other bodies to test with at the
> moment.
>
> Visual examination tells me only that while the shape and size of the
> meter coupling lever is slightly different than for example on the
> extension tube and the lens I tested with, the position of the lever that
> indicates the aperture is the same, or close enough.
>
> I checked the manual in case I had missed something, but the only related
> information was not to apply force to the coupling levers and not to use
> the tube in combination with other extension tubes.
>
> One thing I did not check yet was how far the lever extends out of the
> mount. Perhaps it has suffered some impact and is now too short to connect
> to the body properly. Can't check it out while I'm at work though.
>
> Would be grateful for any advice. Although I suppose by my description it
> may be difficult to tell what exactly is wrong with it :) I'm just
> posting in in the hopes that perhaps the tube or the meter coupling
> lever is a 'repeat offender' and there's some known fix to these symptoms.
>
> priit.
>
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