A fast, normal prime designed for Micro Four Thirds mirrorless cameras, the Panasonic Lumix G 25mm f/1.7 lens  is a 50mm equivalent lens featuring a bright f/1.7 maximum aperture for enhanced low-light shooting and depth of field control. One UHR (Ultra-High Refractive Index) element pairs with two aspherical elements to reduce chromatic aberrations and distortions for consistent edge-to-edge sharpness and illumination. The optical construction also helps to realize a compact overall form factor, measuring just 2″-long and weighing 4.4 oz. Benefitting both stills and video capture, this lens also incorporates a stepping motor for smooth, quiet autofocus performance that is compatible with Lumix cameras’ high-speed contrast-detection focusing systems.