Excellent Sigm filter,
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This review is from: Sigma EX DG 77mm Digitally Optimised UV Filter (Electronics)
Only bought this to protect my lense. It is the second filter that I buy, as the first one protected my lense when it felt to the ground. I almost thought that I would lose it. You won't see me without the these first line protection.
I don't see any kind of image aberration with it. Images are sharp as they are meant to be.