Canon EF 135mm f/2.0L USM

The Canon EF 135mm F2.0L USM has been in Canon's lineup since the late '90s but remains justifiably popular for its fast maximum aperture, good optical quality and typical L-series build quality. Optical construction includes two UD (ultra low dispersion) glass elements, and a ring-type ultrasonic focus motor provides fast and silent AF with full-time manual focus. The EF 135mm F2 is compatible with Canon's Extender EF 1.4x II and 2x II teleconverters, but it is not stabilized, so a tripod is recommended for critical work, especially with a teleconverter.