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| p.1 #6 · Tamron SP 35-80 f2.8-f3.8 and horrible flare |
Mine behaves this way as well, but only if it is exposed to direct light such as the sun, or a light bulb.
The very first shot I took with it was in my mother's kitchen. The shot was backlit by bright light coming through the window. Terrible "blue glow". Just awful. If I am not careful, that's what I get from it.
As you say, it is otherwise an excellent lens, which is why I keep it. If you avoid situations that exacerbate the issue, it works great.
Granted, I would use it a whole lot more if it didn't have this issue. I somtime wonder if it would be better if all the coating was polished right off. I'd rather have "grey glow" than "blue glow".
Either way, I've managed to get the following results out of it...
I remember when I composed the last shot, I could see the glow because a spot of sun was touching the lens. I stepped to the right about 3 inches and it vanished.