The Canon RF 50mm F1.2L USM is an ultra-fast prime lens for the company's full-frame mirrorless system. This durable, weather-sealed lens features UD and aspherical elements as well as Air Sphere, Super Spectra and fluorine coatings. It has a ten-blade aperture, 40cm (15.8") minimum focus distance and uses 77mm filters. There's also a customizable control ring that can serve a variety of purposes.