The Panasonic LUMIX S Pro 50mm F1.4 is a large-aperture fixed focal-length with impressive image quality and rugged lightweight design, interchangeable with L mount camera bodies. Its 50mm focal length and F1.4 high speed ensure versatile use and stunningly high resolution with descriptive performance From center to corners of your images. Key Features: Lumia S Pro camera lens – 50mm fixed focal F1. 4 l-mount lens, Leica Certified for Lumia S Series full-frame L mount Mirrorless cameras Lens elements 13 lenses in 11 groups; 2 aspherical lenses and 3 ED (extra-low dispersion) lenses effectively suppress both axial chromatic aberration and chromatic aberration of magnification Lens focusing a double focus system combines a linear motor and stepping motor to achieve sensor Drive At a maximum speed of 480 FPS for fast, high-precision autofocus Lens filter size 77mm diameter filter with an 11-blade circular aperture diaphragm Rugged lens design dust/splash/freeze-resistant design withstands use under harsh conditions for high mobility