500mm f/8 telephoto lens (t mount) with 2x teleconverter (=1000mm) for sony alpha a450, a500, a550, a290, a390, a560, a5

This powerful 500mm f/8 manual focus telephoto lens utilizes aluminum alloy construction, computer-designed all-glass optics and the latest optical multi-coating techniques to provide crisp, high-contrast, virtually flare-free images of distant subjects, even under adverse lighting conditions. it features an aperture range of f/8 - f/32 and a rotating tripod mount, and it comes with a soft carrying case. perfect for nature, sports and surveillance photography. this 2x teleconverter attaches to any t-mount (screw mount) lens, and effectively doubles the focal length of that lens, allowing the photographer to get much closer to the action. this simple, yet high-grade adapter provides excellent optical quality at an affordable price.