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Amazon.com : Rokinon 10mm F2.8 ED AS NCS CS Ultra Wide Angle Lens for Pentax K and Samsung K Mount Digital SLR Cameras (10M-P) : Electronics
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New 0.43x High Definition Wide Angle Conversion Lens For Pentax K-50 (Only For Lenses With Filter Sizes Of 49, 52 or 58mm) - Walmart.com
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