Overview

The Canon EF 400mm f/5.6L USM is a lightweight, solidly built super-telephoto prime with excellent sharpness, especially in the center, and well-controlled chromatic aberration and distortion. Its fast, quiet autofocus and convenient built-in hood are praised, but the lack of image stabilization is a notable drawback for handheld use in low light. It suits wildlife and sports photographers on a budget who prioritize optical quality and portability over zoom flexibility or IS.