ZEISS Batis 85mm f/1.8 Lens for Sony E Mount Mirrorless Cameras, Black

Description Performance Focal length 85 mm Aperture range f/1.8 – f/22 Camera Mount Sony E-Mount* Format compatibility Full Frame Focusing range 0,80 m (2.6 ft) – ∞ Free working distance 0,71 m (2.3 ft) – ∞ Angular field** (diag. horiz. vert.) 29° | 24° | 16° Diameter of image field 43 mm (1.69″) Coverage at close range (MOD)** 189 x 283 mm (7.4 x 11.1″) Image ratio at minimum object distance 1:7.9 Lens elements | groups 11 | 8 Flange focal distance 18 mm (0.71″) Entrance pupil position (front of image plane) 18 mm (0.72″) Features Autofocus Image Stabilization Physical Filter thread M67 x 0.75 Rotation angle of focusing ring Focusing not mechanically coupled Diameter max. 92 mm (3.6″) Diameter of focusing ring 78 mm (3.1″) Length (with lens caps) 105 mm (4.1″) Length (without lens caps) 92 mm (3.6″) Weight 452 g (1.0 lbs) A lens with relatively few glass-air surfaces, it was developed by Dr. Ludwig Bertele at ZEISS in 1930. At the time it was one of the fastest high-speed lenses for 35 mm photography, with apertures as large as 1:1.5 and high contrast thanks to effective stray light reduction. Its high speed and high contrast helped give the lens its name, which is derived from the word “sun,” the symbol of maximum brightness. You continue to find the aforementioned benefits with modern lenses in the normal and telephoto ranges whose optical design is based on this basic type. Sonnar Design Lens made of special glass with anomalous partial dispersion  “Floating elements” design