Product Details: Superior Large-Aperture Performance - Like other large-aperture Carl Zeiss lens designs, this f2.0 lens is simply magnificent in its ability to capture brilliant high-resolution images in low-light conditions requiring fully open aperture. SSM (Super Sonic wave Motor) - Designed for fast, smooth, silent automatic focusing, this unique technology achieves high torque at low speed with rapid start/stop response. It operates through the ability of a piezoelectric device to reshape itself quickly when voltage is applied. Carl Zeiss T Coating - Coated optics were pioneered by Carl Zeiss and this superb lens features T (T-Star) coating that virtually eliminates the lens flare, internal reflection and light scattering that can otherwise occur at glass-to-air surfaces. Glass-Molded Aspherical Lens Elements - These precision lens elements correct distortion for sharper, more visually accurate images. ED (Extra-low Dispersion) Glass - Because light of different wavelength (or color) bends at different angles when it passes through a lens, ED (Extra-low Dispersion) Glass is used in Carl Zeiss lenses to eliminate chromatic aberration by correcting certain wavelengths of light for sharp, clear images with well defined colors. Product Specifications: Optics/Lens Lens Type: Distagon T 24mm F2 ZA SSM Lens Mount Type: Sony A-mount Aperture: f/2.0 Aperture (Max.): f/2.0 Aperture (Min.): f/22 Filter Diameter: 72mm Lens Groups-Elements: 7 groups, 9 elements (2 aspheric surface) Minimum Focus Distance: 7.56 (0.19m) Aspheric Elements: 2 aspheric Depth-of-Field: Yes Distance Encoder: Yes Distance Scale: Yes Angle of View: 84 degrees (35mm) 61 degrees (APS-C) Aperture Blade: 9 aperture blades Dimensions (Max. Diameter x Length): 3-1/8 x 3 (78 X 76mm) Focal Length (35mm equivalent): 36mm Focus Ring in AF Mode: No Rotation Focus-hold Button: Yes Internal Motor: Yes (SSM) Lens Weight: 19 5/8oz (555g) Maximum Magnification: x0.29 Weights and.