oil in aperture blades

B

blimey

Established
Local time
10:24 AM
Joined
Oct 7, 2009
Messages
100
Location
nyc
View My Gallery
Hi Everyone,

I just acquired a pre-asph 50mm lux and there happens to be oil marks on the blades. The oil mark is visible only by looking at the rear element.

Does this affect anything at all?
 
Not really in the rangefinder system. It slows focusing down in Autofocus SLRs.

*this is always what i've been told. never used an autofocus SLR.

also, are you sure it's not just wear on the blades?
 
Last edited:
Strange that you see it only from the rear; maybe just wear (which is normal) ?

Anyways, a bit of oil doesn't hurt - unless it causes haze on the surfaces next to the aperture.

Roland.
 
attachment.php


here is a picture of the oil residue, captured using iphone 3gs.

it does not look like a wear in the blade as well.
 

Attachments

  • oil.jpg
    oil.jpg
    46.6 KB · Views: 0
In "automatic aperture" lenses, mostly found in modern SLR where viewing is done through Lens wide-open but stops down to aperture selected on exposure.

Oil on the blades slows or stops lens closing down when shutter is tripped, which could cause over-exposure.

In manual diaphragm lenses, as in all RF cameras, a little old doesn't hurt.
 
You must log in or register to reply here.
Back
Top Bottom