Maybe John Hermanson has a suggestion. The rounded corner on the meter
arm doesn't sound right. Perhaps you could also bend the auto tube's
coupling arm outward.
Chuck Norcutt
priit@xxxxxxxxx wrote:
>
> On Fri, 29 Dec 2006, Chuck Norcutt wrote:
>
>> 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.
>
> That was an excellent suggestion, thank you. Using this approach I was
> able to see what's going on. The lever actually moves the arm correctly up
> to f/8, but going from there to f/5.6 it invariably slips past the arm and
> gets stuck.
>
> It does not even look like if anything was bent. The corner of the meter
> arm is a bit rounded and the lever on the telescopic tube is quite long
> and therefore not as rigid as the ones on lenses or shorter tubes. It has
> also a lot of room to move sideways, in this case towards the centre of
> the mount. I guess this makes it easier to slip by the meter arm.
>
> priit.
>
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