Vivitar 2x macro focusing teleconverter helicoid (Canon FD): Adapted Lens Talk Forum: Digital Photography Review
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Amazon.com : Bower 2X Teleconverter for Bower, Rokinon, Vivitar, Samyang, 500mm 800mm & 650-1300mm T-Mount Lens : Electronics
![Amazon.com : Vivitar 500mm f/8.0 Telephoto Lens with 2X Teleconverter (=1000mm) + Monopod Kit for Nikon D3200, D3300, D5300, D5500, D7100, D7200, D750, D810 Camera : Camera Lenses : Electronics Amazon.com : Vivitar 500mm f/8.0 Telephoto Lens with 2X Teleconverter (=1000mm) + Monopod Kit for Nikon D3200, D3300, D5300, D5500, D7100, D7200, D750, D810 Camera : Camera Lenses : Electronics](https://m.media-amazon.com/images/I/71umxI+ZWIL._AC_UF894,1000_QL80_.jpg)
Amazon.com : Vivitar 500mm f/8.0 Telephoto Lens with 2X Teleconverter (=1000mm) + Monopod Kit for Nikon D3200, D3300, D5300, D5500, D7100, D7200, D750, D810 Camera : Camera Lenses : Electronics
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