Opteka 420-800mm f/8.3 HD Telephoto Zoom Lens for Sony E-Mount a9, a7r, a7s, a7, a6600, a6500, a6400, a6300, a6100, a6000, a5100, a5000, a3000, NEX-7, 6, 5T, 5N, 5R and 3N Digital Mirrorless
Amazon.com : Opteka 58MM 0.35x Fisheye Wide Angle Lens Compatible with Canon DSLR Cameras Including Macro Close Up Attachment : Camera Lenses : Electronics
Opteka 500mm/1000mm f/8 Manual Telephoto Lens for Canon EOS RF-Mount R6, R5, Ra, RP and R Mirrorless Digital Cameras (White) - Walmart.com
Opteka 500mm/1000mm f6.3 Telephoto Lens for Nikon F D3500 D3400 D3300 D3200 | eBay
Opteka 500mm/1000mm Telephoto Lens for Nikon F D3500 D3400 D3300 D3200 D3100 | eBay
Opteka 500mm f6.3 DG - Lens
Opteka 500mm f/6.3 Mirror Lens for T Mount OPT5006M B&H Photo
Opteka 0.20X HD Professional AF Wide Angle Fisheye Lens
Opteka 50mm f/2 Lens for Fujifilm X OPTM5020F B&H Photo Video
Opteka 650-1300mm Super Zoom Lens for Fuji X-Pro2, X-Pro1, X-T20, X-T10, X-A10, X-E2S, X-T2, X-T1, X-E2, X-E1, X-M1, X-A3, X-A2, and X-A1 X Mirrorless Digital Cameras - Walmart.com
Opteka 500mm f/8 High Definition Preset Telephoto Lens
Making it as a Pro: Lens Review: Opteka 500mm f/8 Mirror Lens