New Opteka 500mm f/8 with MicroFourThirds mount (?) – 43 Rumors
Opteka 500mm / 1000mm High Definition Mirror Telephoto Lens for Pentax K-1, K-3 II, KP, K-70, K-S2, K-S1, K-500, K-50, K-30, K-7, K-5, K-3, K20D, K100D and K10D Digital SLR Cameras
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Amazon.com : Opteka 500mm/1000mm f/8 Manual Telephoto Lens compatible with Canon EF-Mount EOS 90D, 80D, 77D, 70D, 60D, 60Da, 1Ds, Mark III II 7D, 6D, 5D, 5DS, Rebel T8i, T7i, T7s, T7,
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Amazon.com : Super 500mm/1000mm f/8 Manual Telephoto Lens for Kodak PIXPRO Compact System S-1 Digital Camera : Electronics
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Amazon.com : 1000mm Lens for Pentax K-7 (Manual Focus) : Electronics
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Amazon.com : Opteka 500mm/1000mm f/8 Manual Telephoto Lens for Canon EOS 80D, 77D, 70D, 60D, 7D, 6D, 5D, 5Ds, Rebel T7i, T7s, T6i, T6s, T5i, T5, T4i, T3i, T3, T2i, T1i, SL2
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Opteka 500mm / 1000mm High Definition Mirror Telephoto Lens for Pentax K-1, K-3 II, KP,
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Meade 90B,1000mm f/11 Mirror Lens,D=90mm,USA Made,Celestron EOS Scope VTG '83 ! | eBay
