oil in aperture blades

[blimey]

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?

 

[WalterM]

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?

 

[blimey]

Not really in the rangefinder system. It slows focusing down in Autofocus SLRs.

Thanks for the reply WalterM. I guess I will CLA this sometime in the future but will enjoy it for now.

 

[ferider]

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.

 

[blimey]

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

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

 

[Frankie]

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.

 

[blimey]

Thank you for the input everyone.