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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