Canon EF 300mm f/4.0L IS USM

The Canon EF 300mm F4.0L IS USM is a relatively compact (but at 1190 grams not particularly lightweight) L-series telephoto prime lens, compatible with Canon's full-frame and APS-C DSLRs. The 300mm F4 trades brightness for portability, but a dual-mode (for normal and panning shooting) image stabilization system allows you to shoot at shutter speeds up to two stops lower than would otherwise be possible without a tripod. Optical construction consists of 15 elements in 11 groups, including two UD (ultra low-dispersion) elements and the lens is weather-sealed.