The 35mm f/1.4 AS UMC is built as a fast, wide angle, manual focus prime lens used for fast standard prime when used on APS-C/DX sensors or for full frame cameras. It is constructed with Ultra Multi Coating of Samyang Optics to reduce flare and ghost and achieve crisp color image, Glass aspherical lens and High refractive lens to gain brighter image and lessen color aberration. The Circular F1.4 aperture with 8 blades provides light rays beautifully for a touching photography. This lens has 35mm focal length and fits filters with 77mm filter thread. Product Features in Detail Fast, wide angle, manual focus prime lens Samyang 35mm F1.4 AS UMC is a fast, wide angle, manual focus prime lens for full frame cameras and also for APS-C sensors. It is a professional prime lens which delivers exceptional resolution and sharpness with outstanding optical construction. Glass aspherical lens (ASP) It minimizes color aberration to realize exceptional image quality and high contrast for center and corner of image even when aperture is fully opened. High refractive lens (HR) High quality refractive lens gives you brighter image. Ultra Multi Coating (UMC) of Samyang Optics Ultra Multi Coating of Samyang Optics is used to minimize flare and ghost and realize crisp color image. Circular aperture with 8 blades 8 aperture blades create almost a full circle when closed and express ray beautifully as starlight. Bright F1.4 aperture Smooth focal control gives you precise adjustment and also F 1.4 wide aperture gives you touching photography.