Sony FE 400-800mm f/6.3-8 G OSS LensE mount 400 800 mm super telephoto zoom The FE 400 800 F6. 3 8 G OSS is Sonys first Lens that covers the 800 mm super telephoto zoom range. Optional 1. 4x and 2x teleconverters can be used to extend that range up to 1600 mm. Super telephoto focal lengths are ideal for birds and wildlife, sports, aircraft, and other subjects that cant be approached closely, as well as scenes that benefit from telephoto compression. Internal zoom and optimized zoom