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Tokina announces new 500mm F8 Reflex telephoto lens for six APS-C, full-frame camera systems: Digital Photography Review
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Opteka 500mm/1000mm f6.3 HD Telephoto Mirror Lens for Pentax K-S1, K-500, K-50, K-30, K5 IIs, K-7, K-5, K-3, K-2, K-X, K - Walmart.com
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