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.

Quick specs

Lens type	Prime lens
Focal length	300 mm
Image stab.	Yes (2 stops)
Lens mount	Canon EF
Max aperture	F4
Min aperture	F32
Min focus	1.50 m (59.06″)
Max magnification	0.24×
Weight	1190 g (2.62 lb)
Length	221 mm (8.7″)

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