Talking about the aperture mechanism, my 90/2 just have aperture coupling
lever disengaged after some 1:2 shots, it was the second time, it seems that
the aperture coupling lever is a bit too short when the lens extended to
maximum. Together with the space require for coupling ring/stop down ring
movement, the aperture lever sometimes went out of position.
C.H.Ling
----- Original Message -----
From: "John Hermanson"
>I often put a dot of rubber cement on spring ends. They are often just
> a loop hooked through a hole.
>
> 90 f2 diaphragm could become sluggish due to oil in the coupling ring.
> It's a big ring and imo should have been designed with some ball
> bearings (same goes for 100 f2).
> ___________________________________
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