The Fujinon MKX50-135mm T2.9 Lens in X-Mount is a lightweight cine-style zoom lens for X-mount cameras with a Super 35mm-sized sensor. The electrical contacts within the lens mounts allow communication with X-series cameras. It features a mechanical design with three independent lens control rings: focus, iris, and zoom. The lens weighs only 2.16 pounds, which is fairly light for a cinema zoom that holds focus and aperture throughout the focal length range. It is designed for cameras with a Fuji X-mount, so it has a short flange focal distance, but the lens allows flange focal distance adjustment so you can fine-tune it to the camera you are using the lens on. This communication also enables you to achieve a variety of color expressions when using Film Simulation modes. The gear rings positions for focus, zoom, and iris are located at the same position on both lenses in the MKX series, making switching between the two zooms quick as you don't have to adjust the position of lens accessories.No shims are required to adjust the flange focal distance as this lens has a built-in adjustment mechanism