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Sigma EX DG Circular 8mm f/3.5 Fisheye Lens for Nikon Mount - Black | Digital SLR Lenses | Sigma at Unique Photo
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Amazon.com : Sigma 8mm f/3.5 EX DG Circular Fisheye Fixed Lens for Nikon SLR Cameras : Camera Lenses : Electronics
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Comparing sharpness underwater of the Sigma 15mm and Tokina 10-17mm fisheye lens on a ful-frame Nikon D800 camera - Underwater Photography Guide
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