Item Type: Manual Focusing Telephoto Lens Material: Alloy, optical glass Lens Structure: 4 pieces and 4 groups Focal Length: Approx. 500mm/19.68in Nearest Focusing Distance: Approx. 5m/16.4ft Aperture: F6.3-F32 Front Filter Diameter: Approx. 86mm/3.38in Package List 1 x Lens 2 x Lens Cover 1 x Adapter Ring 1 x Wrench 1 x Storage Bag 1 x User Manual 1Optical Design: 4 group, 4 piece optical structure with multi layer MC coating suppresses lens spotting and ghosting, improving contrast and color fidelity. 2Lens Type: A precision achromatic refractor mirror design is used to obtain images with good peak contrast and flare control. You can use this lens in "M" manual exposure mode. 3Accurate Scales: Manual focus design is complemented by depth of field and distance scales, which facilitate the use of pre focus technology to provide pointed, clear images. 4Exquisite Craftsmanship: The lens can be used with the included T2M4/3 adapter ring. High strength alloy body and optical glass, strong texture and beautiful appearance. 5Photography Essentials: The 500mm F6.3 ultra long fixed focus lens is a great choice for bird and wildlife photography as well as ultra long distance shots.