Archived posting to the Leica Users Group, 1999/03/22

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Subject: Re: [Leica] Oil on Lens Blades: How bad is it?
From: D Khong <dkhong@pacific.net.sg>
Date: Tue, 23 Mar 1999 06:21:33 +0000
 
>For a rangefinder lens, it does not affect performance until it eventually
>gets onto the lens elements themselves, requireing a strip down and clean.
>For SLR's if there is oil on the blades, the auto diaphram will be sticky
>and possibly not close or open properly when the shutter is fired.  It is
>for this case that people state, no oil on blades.
>
>
>Regards,
>
>Robert
>

I recall the worse case of oil in blades was with my Micro-Nikkor 55/2.8.
I had to send that lens in for CLA every few years just to get rid of the
stickiness in the auto diaphragm due to lube oil accumulating at the
fringes of the blades.   No trouble at all with my leica lenses.

Dan K.