If the lens becomes hot -in a car for example- the oil evaporates and later
condenses on the aperture blades or/and the lenses. This effects picture-
and exposurequality additionally by catching dust, that is thrown into the
lens by the mirror (like a door you shut hard). The lense shold be cleaned
soon by the service. For a lens with few elements it is a little job (in
Germany about 50,-DM), but for lenses with floating elements it is a very
great job.
Jochen
----- Original Message -----
From: "Michael Stahulak" <mstahulak@xxxxxxxxxxxxx>
To: <olympus@xxxxxxxxxxxxxxx>
Sent: Monday, March 19, 2001 7:19 PM
Subject: [OM] Oil on aperature blades!!!!
> I was going over my lenses last night (still trying to figure out what I'm
> taking on my backpacking trip - and what I'm going to carry it all in),
and
> I noticed -- oil on the aperture blades of my 135/2.8 !!!. I also noticed
a
> little sluggishness in aperture operation. It seems to me that there was
no
> oil on the blades the last time I played with this lens only a week or two
> ago.
>
> As far as the aperture sluggishness, it seems to me that the way OM lenses
> work (normally open, stop down driven directly?) that it can't be a real
> issue in photographs. Or can it?
>
> Can anyone tell me how this happened, what (if anything) to do to fix it,
> and what it means practically (aside from the already noticed
sluggishness)?
> I have to confess that I've had this lens for probably 24 years, and have
> used it very little in this time, so aside from carrying it all over with
> me, it should be in good shape.
>
> BTW, thanks everyone for all the recommendations for a backpacking kit and
> ways to carry it. When I've finally sorted out what I'm doing, I will
report
> back to the group.
>
> Thanks,
>
> Mike
>
>
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