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Leica thread is currently non existent, it seems, but I'm using this on a film camera, so best place to ask here.
This Summicron-C 40mm has this strange black line inside the lens. It's embedded within. Now, it's far too dark to be lens fungus, but it's clearly darker and thicker than your regular dust. It almost looks like a small piece of human hair, but that's impossible, right?
I'm just looking for answers to whatever the fuck this is.