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This lens on my full frame sensor is terrible. There is a great deal of distortion in the upper left and lower left corners and heavy distortion along the entire right side of the picture. Even when zoomed to 24 it can't compare to my Canon 24-105. I don't know if this is normal for this lens or if it's defective and I don't care to find out. If Sigma's quality control is no better than this I've had it with Sigma!
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