Canon EF 135mm F2L 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.