The new standard The RF 50mm F1.8 STM is a small, light and affordable lens with a fast f/1.8 aperture, ideal in low light and great for creative depth-of-field. With new optics and a very quiet STM motor, this modern nifty fifty will advance your photography. Wide aperture creativity Create artistic and impactful images at lower ISO thanks to a wide f/1.8 aperture that achieves sharp focus on a subject yet delivers a beautiful blurred background. Sharp, quiet focusing The STM (Stepping Motor) technology focuses very smoothly and in near-silence, ideal for stills and video. Super Spectra Coating on the lens elements ensure quality. Compact and lightweight At 160g and 40.5mm, it is a highly compact and lightweight partner for your day-to-day shooting with EOS R-series cameras, with no adapter required.