1??Optical Design: 4 group, 4 chip optical structure with multi layer MC coating suppresses lens spotting and double vision, improving contrast and color fidelity. 2??Lens Type: A sophisticated achromatic refractor design is used to obtain images with good peak contrast and flare control. You can use this lens in "M" manual exposure mode. 3??Telephoto Lens: The 500mm F6.3 ultra long zoom lens is a great choice for bird and wildlife photography as well as ultra long distance shots. 4??Physical Design: A tripod mount and removable lens hood are also included to help minimize lens flare and ghosting. The rotatable tripod mount provides optimal balance and allows for quick and easy vertical format shooting when rotated. 5??Accurate Scale: The manual focus design is complemented by depth of field and distance scales that make it easy to use Pre Focus technology delivers sharp, clear images. 6??Prime Material: Premium alloy body with strong texture, exquisite appearance and fine craftsmanship. When used with the included T2 SL adapter ring, it can be used for L port lenses of microsingle cameras.