Canon EF 50mm f/1.8 STM Lens 50mm focal length and maximum aperture of f/1.8 Great for portraits, action, and nighttime photography Minimum focusing distance of 1.15 ft. (0.35m) and a maximum magnification of 0.21x Stepping motor (STM) delivers near silent, continous Move Servo AF for movies and smooth AF for stills 80mm effective focal-length on APS-C cameras, 50mm on full-frame cameras