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Amazon.com : Sigma 18-35mm F1.8 Art DC HSM Lens for Canon, Black (210101) : Camera Lenses : Electronics
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Does the Sigma 18-35mm f1.8 hold focus when zoomed? And could your lens adapter be part of the problem or solution? - Newsshooter
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Amazon.com : Sigma 18-250mm f3.5-6.3 DC MACRO OS HSM for Canon Digital SLR Cameras : Camera Lenses : Electronics
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