> > If you are certain that it's not the oil, then it could be an aging
>spring.
>
>Ah, so I would need a replacement spring from a good lens, I assume. How
>hard is it to replace the spring? Do the blades scatter everywhere if I
>remove it?
>
>chris
The most difficult part is to remove the 5 screws on the lens mount,
undamaged. If the lens has not been repaired and you do not have the right
screwdriver (rigid and perfect fit), quite possible you will damage the
screwheads in some way (I know because I did). Once the lens mount was
removed, you can access the inside of the lens quite easily. The aperture
blades will stay intact even without the spring. To see of it's the spring
that caused the problem, simply set the lens to f22 or f32, then flip the
coupling arm which should be light and fast. If the arm has no resistance
(or almost none), you can be sure it's the spring. I suggest you do this
little test before open up your lens.
regards,
Alan Chan
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