Tokina SZX SUPER TELE 400mm F8 Reflex MF is a 400mm super telephoto lens with a catadoptic optical design.This lens offers one of the new choices for more compact lenses for many photographers looking for a lens that is easy to carry.The SZX SUPER TELE 400mm F8 Reflex MF was designed with more active photographers in mind, and was developed to create a new era of photography, as well as a compact and lightweight lens when shooting outdoor scenery, wildlife, birds, and more.Tokina SZX SUPER TELE 400mm F8 Reflex MF is ideal for travel photography, because the lens is compact and lightweight. It helps capture distant subjects that cannot be reached by standard zoom lenses.Of course, it not only magnifies the distance, but also performs best in a variety of photographic genres, such as landscape, portrait, street, macro, nature, sports, etc.The interior material of the mirror lens has a multi-layer anti-reflection coating for effective light intake and increased shutter speed in low light conditions. The reflective surface also includes a highly reflective silver coating and a protective antioxidant layer on the back to prevent deterioration of the reflective surface.Mirrored lenses, including the Tokina SZX SUPER TELE 400mm F8 Reflex MF, create a donut-like super smooth bokeh with its unique optical configuration.It will make a very impressive depiction and help create fantasy pieces that ordinary refractor lenses cannot match. The mounting part of the SZX SUPER TELE 15.7 inches (400 mm) F8 Reflex MF uses a T-mount (0.75 mm pitch and 1.7 inches (42 mm) thread, allowing you to change the camera mount by using a separate T-mount adapter.Product Specifications:Focal Length: 15.7 inches (400 mm)Brightness: F8 (fixed)Lens Composition: 6 pieces in 2 groupsAngle of View: 6° 8' (35mm format)Filter Diameter: 67mm (front side), 30.5mm (mounting side)Minimum Focus Distance: Approx. 4.5 ft (1.15 m)Maximum shooting magnification: 1:2.5Focus Method: Manual focus (front ball extrusion)Size: 4.4 x Φ2.9 inches (112 x 74 mm) (mirrorless mount), 3.2 x 2.9 inches (82 x 74 mm) (SLR mount).Weight: 19.3 oz (545 g) (mirrorless mount), 17.6 oz (500 g) (SLR mount).This product is a manual lens that does not have electronic contacts. EXIF information is not stored. All shooting is manual operation.This product has a very long focal length and is easy to transmit vibrations such as vibrations, so we recommend securing the camera to a tripod when shooting.