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Sigma 12-24mm f4.5-5.6 EX DG Aspherical HSM

Review Date: Apr 27, 2006 Recommend? yes | Price paid: $669.00

Pros: Well built.
Heavy distortion in the upper and lower left corners and along the entire right side of picture. Bad throughout the zoom range.

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!