JohnJ Offline Upload & Sell: Off
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This is not a problem and won't cause any issues with image quality. As stated by others, it is the black paint at the edges of the elements degrading a little. It's not a problem (not one worth worrying about anyway). It's not 'fishy'. Many Schneider lenses have it and it has come to be known as Schneideritis.
Can't say I've ever directly compared two otherwise identical lenses, ie one with and one without this paint degradation, but if anything, it 'might' result in slightly lower contrast, but probably not (IMHO). I wouldn't even think twice about it if the rest of the lens is good.
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