Seen it before -- sounds like element separation.
> Looking through the rear of my 50/1.4 I see what looks like a blue tinged
> streak. It's maybe 1/4 inch in length if that long. I have to hold the
> lens at just the right angle in just the right light to see it. The best
> way to describe it is to compare the color to that of a small area of
> standing water or wet street asphalt that has a little bit of motor oil in
> it. Has oil migrated to the glass? There's no haze or fogging and my
> prints don't show anything. Any ideas?
>
> Thanks,
>
> Gary
>
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