The Canon 50mm F1.2 L lens boasts the highest quality of the L-series, reflecting Canon's highest standards of precision optics. The L-series is Canon's top range of professional lenses. The L-series also stands out for its outstanding image performance and functionality and dust and moisture resistant construction. With a maximum aperture of f/1.2, the Canon EF 50mm allows excellent shooting speed in low light conditions, without using a flash. Thus, you will also be able to assume a greater and more rigorous control of the depth of field. The circular aperture helps create an attractive, even background bokeh – perfect for isolating subjects at large apertures and for portrait shots. The Canon 50mm lens has a USM-type ring – ultrasonic motor – which uses ultrasonic frequency vibrations to trigger autofocus extremely quickly, and almost silently. It also has a very fast CPU and an improved AF algorithm, which contribute to higher AF speed. Support torque stops the focusing lens group without overlap, so permanent electronic manual focusing override is possible without having to turn off the AF.