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Distortion has a lot to do with focal planes. Shooting on a full frame camera with a 17mm lens isn't the same as a crop sensor with a equivalent wide angle such as a 10mm lens. What dane(Lucky7) and I are talking about is an actual loss in sharpness. It takes a lot of precision in lens design to hold clarity through a 2:3 crop factor out to 10mm. That precision is lacking in the sigma 10-20mm that dane and I own. Don't get me wrong its a great lens but its not perfect.
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-Grant
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