• (Super Telephoto with Small Body): This mirror lens is compact and lightweight with a 15.7 inches (400 mm) super telephoto lens • Distinctive "Ring Boke": The bokeh part is a "ring boke" that makes it a fantastic depiction • 【Easy to replace with different mounts】 Replace the T-mount adapter and change the mount easily • (Adopts a new T-mount adapter) Uses a new and improved T-mount adapter. Designed to reduce inner reflection • Product Specifications: Focal Length: 15.7 inches (400 mm) / Brightness: F8 (fixed) / Lens Configuration: 6 pieces in 2 groups / Angle of View: 6° 8' (35mm format) / Filter Diameter: 2.6 inches (67 mm) (front side), 1.2 mm (mounting side) / Minimum shooting distance: 4.5 inches (11 m) / Focus method: Manual focus (12 mm) / Size: 12 x 12 inches (front ball extrusion method. Φ74mm (mirror) Less mount), 3.2 x Φ2.9 inches (82 x 74 mm) (SLR mount); Weight: 19.3 oz (545 g) (mirrorless mount); 17.6 oz (500 g) (SLR mount)