Specifications: Brand: Viltrox Model: PFU RBHM 20mm F1.8 ASPH Camera Mount: Z-mount Focal Length: 20mm Aperture: F1.8-F16 Aperture Blades No.: 14 Field Angle: (Diagonal / horizontal / vertical)94°12′ / 75°22′ / 56°31′ Format Compatible Frames: Full frame Shooting Distance: 0.25m / 9.84in ~ ∞ Focus: Manual focus(Rear focus) Image Field Diameter: 4.32cm / 1.7in Close Range Coverage: 19.9 * 29.9cm / 7.83 * 11.77in Image Ratio at Min. Distance: 1:8.3 Lens Structure: 12 elements in 9 groups Flange Distance: 1.6cm / 0.63in Pupil Position(Image Surface Benchmark): 8.76cm / 3.45in Filter Specification: M82 * 0.75 Rotation Angle of the Focusing Ring: 148.5° Max. Diameter: 7.68cm / 3.02in Diameter of the Focusing Ring: 7.2cm / 2.83in Item Weight: 782g / 27.58oz Item Size: 13.5 * 5.5 * 8.2cm / 5.3 * 2.2 * 3.2in Package Weight: 1252g / 44.2oz Package Size: 18.5 * 11.8 * 13cm / 7.3 * 4.6 * 5.1in Package List: 1 * Lens 2 * Lens Caps(One Front One Back) 2 * Lens Hoods 1 * Carry Bag 1 * User Manual(English & Chinese)Viltrox PFU RBMH ASPH Lens: This Viltrox PFU RBMH ASPH Lens is a large aperture designed for Nikon Z mount camera. Ddelicate appearance and powerful performance make it a great accessory for photography.20mm F1.8 & 14 Aperture Blades: 20mm f1.8 large aperture and 14 blades ultra-round diaphragm, enjoy the outstanding performance of the lens, capture the wonderful moment of life.Full Frame with Smooth Manual Focus: Full frame ultra wide angle lens, provide excellent imaging performance from the center to the edge of the image, smooth manual focus bring you superior photography experience.12 Elements in 9 Groups Lens: Excellent lens structure of 12 elements in 9 groups, including 1 double-sided aspheric lens, 4 ED lens and 1 short wave length and high transparent lens.Additional Accessories: Comes with lens hoods, front and back caps and a carry bag. The lens hood is used to reduce flare of scattering light of ghost and avoid rain, snow and dust sticking to the front of the lens.