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Sigma has done more for enthusiast APS-C than Nikon, Canon and Sony combined: Digital Photography Review
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Sigma announced three APS-C lenses for L-mount cameras (Leica CL, TL, TL2): 16mm f/1.4, 30mm f/1.4, 56mm f/1.4 - Leica Rumors
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Sigma 8-16mm f4.5-5.6 DC Lens for Canon Digital SLR Cameras with APS-C Sensors: Amazon.de: Electronics & Photo
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Sigma launches 23mm F1.4 DC DN for APS-C Sony E, Fujifilm X & Leica L-mounts: Digital Photography Review
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SIGMA unveils world's smallest and lightest ultra-wide APS-C zoom lens and 70-200mm full-frame sports lens - NotebookCheck.net News
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