Olympus Zuiko Auto-S 50mm 1.4 fungus cleaning

[dbuergi]

Hi all,

i got the named lens with some fungus on the lens behind the aperture. I got to the point shown in the pictures and don't know the final twist to get inside. I marked spots for a lens wrench but nothing is moving.
Maybe someone can help me here?


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[kiddo]

as seen on the screws head, red loctite may have been aplied to lock the thread also, so a good acetone aplied multiple times and patience, might do it, in most of the cases it worked for me , even for the very stubborn yashica ml

[Dan C]

I am at exactly the same stage, with the same issues - did you manage to resolve it?



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[BrianSVP]

This is a lens that I won't even touch anymore, as it's effectively uncleanable.

Even if acetone were to work (it doesn't), the design of the lens effectively means that any acetone you apply to the locked rings will carry the black paint from the ground glass edges around the element directly on to the aperture blades.

I once on a lark submerged the entire assembly in acetone for a week, seeing as the blades were already wrecked, just to see if I could at least get the cells free. Even doing that and heating, I still ended up bending the barrel with the force I applied and still wasn't able to budge the rings.My guess is that it doesn't use regular threadlock that is disolveable with acetone but rather permanent epoxy.

My advice: either decide to can live with the fungus, or find another sample without it.

[RokkorDoctor]

The front cell isn't left-hand thread is it? (I have come across this on lenses where there was no obvious rationale for it even if the cell didn't also contain the lens' front filter thread).

Having said that, given his experience I'm sure BrianSVP would have tried that already.