Canon's ultimate L-series telephoto zoom — the EF 200-400mm f/4L IS with built-in 1.4x extender.
The Canon EF 200-400mm f/4L IS USM, introduced in 2013, is Canon's flagship super-telephoto zoom for professional sports and wildlife photography. Its defining feature is a built-in 1.4x teleconverter that can be engaged without removing the lens, effectively transforming the range to 280–560mm at f/5.6.
The lens delivers a 200–400mm f/4 constant aperture with four stops of Image Stabilisation, Canon's ring-type USM autofocus, and fluorite and UD glass elements for chromatic aberration control. The built-in TC extends usable range to 560mm f/5.6. It weighs approximately 3,620 grams and requires substantial support.
The integrated teleconverter removes the need to carry and swap a separate 1.4x TC in the field, a critical operational advantage for photographers working fast-moving subjects. It competes with the Nikon 200-400mm f/4G VR but the Canon's integrated TC sets it apart. Heavily used in professional football, tennis, and wildlife circuits.
Test the built-in TC engagement lever for smooth, positive operation and verify AF accuracy in both modes. Confirm the IS system is functioning across all stabilisation modes. Inspect the front element for impact marks or coating wear. Tripod collar rotation should be smooth with positive click-stop detents.