STM Auto Focus Motor Produces Fast, Precise and Quiet Auto Focus. Manual Focus Mode. F1.4 Max Aperture. F16 Min Aperture. Metal Aperture Ring With Precise Detent Click Stops. Multicoated Optical Glass 2 Customizable Buttons. The FN2 button is set to the minimum focus distance. A single press switches the lens to the minimum focus distance, and a long press locks the current focus distance. This feature adds more convenient and quick operation when using the lens. 72mm Filter Ring. Includes Pre-installed 72mm Inlaid Adapter for use with 72mm Revolution & Revolution Plus Magnetic Filters (Filters are not included). Lens Construction: 10 Groups 13 Glass Elements. (5 low-dispersion glass elements + 2 high-refractive-index glass elements). Lens Dimensions: 82mm Diameter. Length 99mm. Weight: 580g. Aperture Diaphram Blades: 13 USB Firmware Upgrade Port. Metal & Poly Carbonate Body. Adopting 10 groups of 13 elements (5 low-dispersion elements + 2 high-refractive-index elements) Excellent imaging quality, superior image resolution, and high-fidelity color reproduction. Even at the fully-open aperture of F1.4, the image remains clear and sharp. The use of low-dispersion and high-refractive-index elements significantly enhances the optical quality of the lens, greatly reducing glare and ghosting. Even in backlit conditions, it can produce high - contrast and high - definition images with high color accuracy. Includes 38mm Bayonet Mount Lens Hood, Front Revolution Plus Front Cap, Conventional Center Pinch Front Cap, Rear Lens Cap, Drawstring Pouch & Instruction Manual