FUJINON MK 50-135 mm T2.9 achieves high optical performance and low distortion with T2.9 speed across the entire zoom range. with MK 18-55 mm, it covers standard 18 to 135 mm focal length for cinema production. Super 35 mm / APS-C sensor compatibility and E-mount dedicated design have LED to an ultra-compact and "less than 1kg. Outstanding optical performance and low distortion with T2.9 speed across the entire zoom range. Covering the standard 18 to 135mm focal length for cinema production with MK18-55mm and MK50-135mm. Ultra-compact & "less than 1kg" lightweight design thanks to Super 35mm/APS-C sensor compatibility with dedicated E-mount design. Fully manual lens rings for focus, zoom, and iris with 0.8M gear pitch. 200 focus rotation angle for accurate focusing. Seamless iris to avoid vibrations and noise that you get with clicking mechanism. Resolves issues of interchangeable lenses for still digital cameras such as "focus shift and optical axis shift while zooming" and "lens breathing". 85mm front diameter, 82mm filter diameter, and position of 0.8M are standardized between the two models. Features macro function. Features flange focal length adjustment function Covers Super 35 Format, Sony E-Mount, Consistent T2.9 Aperture Over Zoom Range, 3 x Standard 0.8 MOD Gears, Clickless 9-Blade Iris, 200 Focus Rotation and Macro Mode, Color Matched to Fujinon HK/ZK/XK Series, 85mm Front Outside Diameter, Weighs 980 grams, Flange Focal Distance Adjustment.