It is very common for the 55 1.2 to have oil on the blades.
PS, Erols access modem in my area has been out of service for atleast 24 hours
so if anyone had been waiting for a response from me, that is why it is
delayed.
John
Dr Peter Gilbert wrote:
> Hi all
>
> have just picked up a Zuiko 55mm F1.2 this afternoon by mail order off the
> web, in what seemed like pretty nice condition. Glass is perfect, some wear
> apparent on front of aperture ring, but my main concern is what may be a
> "sticking diaphragm". I have never seen this condition before, so I'm not
> sure if this is what it is, or even if it is a problem.
>
> When I use the dof preview button (with lens on or off camera) the aperture
> blades seem to close down as per normal, but when I release the dof, the
> blades don't "snap" back as quickly as on my other lenses. They do retract
> smoothly, but slowly. With aperture at f16 and shutter speed set to 1/1000
> on my OM-1n the stop down phase is too fast to see, but after the mirror
> has dropped, the blades can be seen retracting.
>
> Does the fact that the sluggish aperture retraction is occurring *after*
> exposure has been made mean that there isn't going to be any problems with
> exposure (that's what I would think logically anyway) .
>
> I found a related thread on the list from a couple of months back that
> suggested that it is possible to dismantle a lens and remove oil which
> could be the cause, but I would be a bit nervous about this in case I
> couldn't get mine back together again! Lenses like this one don't appear
> too often in Aust.
>
> Is this a problem which a repair centre can easily/safely repair? Is it
> worth worrying about? Will it get worse?
>
> I can put a roll thru over the weekend to try to check it, but any advice
> from the list would be welcome.
>
> I am particularly keen to try this lens. I have read that it has a "lovely
> softness to the out of focus areas". There seem to be many more diaphragm
> blades in this lens (9 or 10?) and I wonder whether this soft quality may
> be due to that mysterious "bokeh" (oh no, here we go again........).
>
> thanx in advance
>
> peter
>
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