YN35mm F2S DF DSM is a small, lightweight, and universal F/2 large-aperture full-frame lens suitable for landscape, night scenes, street photography, food, and other photography subjects. Fn Button With the Fn custom function button, the function menu or shortcut operation can be quickly used to improve the efficiency of creation. Small and Lightweight The maximum diameter and length of the lens is about 67*72mm and the net weight is only about 295g. The lightweight design is portable for daily use and long-term hand-held shooting and video recording. Quiet CNC Stepping Motor Integrated Compared with traditional DC motors, digital stepping motors (DSM) have a fast start-stop response, high focusing accuracy, and quieter focusing actions, which are suitable for photo shooting and video recording. F/2 Large Aperture With an F/2 large aperture, it?s easy to get a soft blur effect. You can also use low sensitivity and higher shutters to shoot in a low light environment. 9 Optical Lenses in 8 Groups with Nano-multilayer Coating The structure which is composed of 9 elements/ 8 groups with nano-multilayer coating effectively improves the light transmittance and suppresses back-light ghosts and glare. Aspheric Lens*1 Various aberrations can be compensated by an aspherical lens integrated. Low Dispersion lens*1 Equipped with a low-dispersion glass lens, which can effectively suppress the dispersion problem caused by wide-angle. 7 Circular Aperture Blades The lens is designed with 7 circular aperture blades. It can shoot circular diffuse spots. It can also take pictures with 14-star effects if the aperture is appropriately reduced. USB Firmware Upgrade With a USB Type-C interface on the lens, you can download the latest firmware for an upgrade to keep the lens at its best performance. Metal Bayonet and Contacts The use of high-precision metal bayonet and gold-plated contacts effectively improves signal conductivity and corrosion resistance. At the same time, it allows the camera and lens to maintain reliable communication and realizes functions such as auto-focus, aperture control, and EXIF information transmission.