Canon 1257B002 EF 50mm f/1.2L USM camera lens

Fast-aperture standard lens

The Canon EF 50mm f/1.2L USM is a professional L-series prime for full-frame and APS-C EOS bodies. Its ultra-wide maximum aperture of f/1.2 delivers extremely shallow depth of field and smooth background blur. An aspherical element and high-refraction glass minimise spherical aberration across the frame. Photographers needing subject isolation at a natural perspective will find it suited to portrait and low-light work.

EF mount constraints

The lens uses the Canon EF mount, so it fits full-frame 35 mm and APS-C format EOS cameras directly. On APS-C sensors the 50 mm focal length provides a narrower field of view equivalent to a short telephoto. The 72 mm filter thread accepts standard accessories. Autofocus is driven by a ring-type ultrasonic motor with full-time manual override; the minimum focus distance is 1.48 ft and maximum magnification is 0.15x.

Upgrade from slower 50 mm primes

Replacing an f/1.8 or f/1.4 standard prime gains two-thirds to one full stop of light and a visibly shallower depth of field at the same framing. The L-series build adds dust and moisture sealing plus a depth-of-field scale with infrared index. The jump is worth it when wide-open sharpness and subject separation are critical to the final image.