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Ricoh updates Pentax 10-17mm F3.5-4.5 fisheye with new coatings and exterior: Digital Photography Review
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Amazon.com : Super Hi Def 0.43x Fisheye Lens for Pentax K-3 K-3 II (for 18-135mm Lens) (62mm Compatible) : Electronics
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HD 0.15x Super Fisheye Lens With Macro for Pentax K-3 K-3 II M2 K-50 K-S1 K-S2 (58mm compatible) - Walmart.com
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