I have had two lens with similar symptoms; a Kiron 24mm f2, and a Zuiko 85mm f2.
The Kiron was cured after the diaphragm was cleaned (oil!). The Zuiko is not too
bad, so I live with it - no winder though. The Zuiko has oil on the diaphragm
blades, but not too much...
Regards, Roger Key
mikew wrote:
>I guess I need a little education here. I always assumed that with respect
>to a lens snappy meant that the action of the diaphragm in stopping down and
>opening back up was very quick, with no hesitation. My first Vivitar Series
>1 28-90 after years of faithful service seemed to stop down as quickly as
>ever but would open back up when it felt like it (which would always be
>several to many seconds later). At the time I was told that this was called
>a sticky diaphragm. That particular lens now gathers dust in my bag.
>Fast forward now. I acquired one of the > 1,000,000 serial number f1.4's in
>an eBay auction. It stops down quickly (at least subjectively) but in
>opening back up, the diaphragm blades seem to glide back into open position.
>This takes some noticeable time (but well less than a second). I came
>across a 50mm f1.2 Zuiko (graded E) on KEH's site late last week, ordered
>it, and received it yesterday. Same diaphragm action as with the f1.4.
>etc.
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