Canon 400mm f/2.8 L IS II USM EF-Mount Lens {Gel II}

Canon's 400mm f/2.8L II: the proven fast telephoto standard

At 400mm with a maximum aperture of f/2.8, this lens gives you the reach of a long telephoto without sacrificing the ability to shoot in low light or separate subjects from their backgrounds at distance. The 16-element, 12-group optical formula incorporates fluorite elements and Sub-Wavelength Structure Coating to control chromatic aberration and flare under high-contrast conditions. The 9-blade circular diaphragm holds its shape well into stopped-down apertures, which matters when your subject is moving through a scene with a complex background.

The ring-type USM motor drives internal focusing with the speed and near-silence that tracking unpredictable subjects demands. IS II image stabilization gives you a working buffer against camera movement during long sessions at the sideline or in a hide. At 3,850g with a magnesium alloy barrel and weather sealing throughout, this is a tool built to stay on a tripod or monopod for hours across a full day's shoot. The 52mm drop-in filter system means you can work with polarizers and ND filters without front-element accessories sized to a 165mm thread.

Who It's For

Sports photographers working from the sideline benefit directly from the f/2.8 aperture under stadium lighting and from USM focus tracking on athletes at full speed. Wildlife photographers in low-light environments, from dusk forest edges to overcast wetlands, gain stops of light that slower 400mm alternatives cannot match. Photojournalists covering events where working distance is fixed and background separation is a necessity will find the wide aperture consistently useful. Birders shooting in flight at distance can pair this lens with a 1.4x teleconverter to reach 560mm while retaining autofocus on Canon EOS bodies.

Key Features

• 400mm f/2.8 prime with ring-type USM autofocus and internal focusing
• IS II image stabilization for low-light handheld work
• 16 elements, 12 groups with fluorite and Sub-Wavelength Structure coating
• 9-blade circular diaphragm holds shape at stopped-down apertures
• 3,850g magnesium alloy barrel with weather sealing throughout
• 52mm drop-in filter system avoids 165mm front-element threads

FAQ

What makes f/2.8 at 400mm useful for wildlife and sports?

That aperture gives you shutter speed in low light-dawn shoots, overcast fields, indoor events-without pushing ISO into noise. You also get subject separation at distance, which is difficult to achieve with slower telephotos even at full frame.

How does IS II stabilization factor into handheld work with this lens?

It buys you 2-4 stops depending on technique and subject movement. On a monopod or tripod, you won't rely on it, but for panned tracking or brief handheld sequences between setups, it's the difference between keepers and soft frames.

Why does internal focusing matter at 400mm?

The front element doesn't rotate or extend during focus, so you can use polarizers and ND filters without vignetting or rotation issues. Focus speed stays consistent across the entire range without changing lens length, which matters during unpredictable action.

What's the advantage of the ring-type USM motor over other AF designs?

Ring-type motors are silent and smooth because the motor drives focusing elements internally without a mechanical cam. That translates to fast, predictable autofocus tracking without hunting, and you can override to manual focus at any point without disengaging the motor.

Is the 52mm drop-in filter system practical for field work?

Yes. You can swap ND or polarizer filters on the fly without removing the lens from a tripod collar or changing lenses. At this focal length and aperture, ND filters are common for managing shutter speed in bright conditions.

Will weather sealing handle a full day of rain or dust?

Sealing throughout the barrel and mount keeps moisture and dust out of the optics and mechanism, but this is a tool for working in wet or sandy conditions, not bathing it. Rinse or dry it after heavy exposure.

What's the working distance at 0.17x maximum magnification?

At 2.7m minimum focus distance, you're magnifying small subjects only modestly-birds, athletes' faces, distant detail. This lens isn't designed for close-up work; it's built for isolation at range.