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Amazon.com : Opteka .35x HD2 Super Wide Angle Panoramic Macro Fisheye Lens for Pentax 645Z, 645D, K-S1, K-500, K-50, K-30, K5 IIs, K-7, K-5, K-3, K-2, K-X, K20D, K100D, K110D and K10D
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Amazon.com : PENTAX DA 10-17mm f/3.5-4.5 ED (IF) Fish-Eye Lens for Pentax Digital SLR : Camera Lenses : Electronics
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