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Opteka 500mm f/6.3 (with 2x- 1000mm) Telephoto Mirror Lens for Canon EOS RF-Mount R6, R5, Ra, RP and R Mirrorless Digital Cameras - Walmart.com
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500mm f/6.3 MF Telephoto Mirror Lens +2x Teleconverter =1000mm for Nikon Canon Sony DSLR Camera and Macro 4/3 Mirroreless Camera| | - AliExpress
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JINTU 500mm/1000mm f8.0 Telephoto Mirror Telescope Lens for NIKON DSLR Camera D7100 D7200 D3400 D90 D5200 D5600 D800 D850 D3200 - Newegg.com
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Amazon.com : 500mm f/6.3 Manual Focus Telephoto Mirror Lens + 2X Teleconverter = 1000mm for Canon EOS Rebel T6s, T6i, SL1, T5, T5i, T4i, 70D, 60D, 60Da, 7D, 6D, 5D, 5DS R,
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