I wonder if the 90/2.0 Macro lens has sliding (extending) levers
inside it just like
the 65-116 auto tube - John?
On 25 Jun 2009, at 4:58 PM, C.H.Ling wrote:
> 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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