Canon 400mm f/5.6 L USM EF-Mount Lens {77} with Built-In Lens Hood

Canon's proven 400mm prime built for reach without bulk

The EF 400mm f/5.6L USM has been a go-to telephoto prime since 1993, and its longevity isn't accidental. The optical formula, 8 elements in 6 groups, including fluorite and Super UD glass, keeps chromatic aberration controlled even at f/5.6, where lesser long primes tend to fall apart. Super Spectra Coating handles flare and ghosting in backlit situations where wildlife and sports photographers spend a lot of time. The ring-type USM motor drives focus quietly and fast, and full-time manual override means you can fine-tune focus without switching modes.

At 400mm on a full-frame body, you're getting serious reach for birds in flight, sideline sports, or distant wildlife. On an APS-C body, the effective 640mm equivalent makes this a field-ready long lens that won't break your back on a day hike. Internal focusing keeps the barrel length fixed during operation, the built-in hood stays ready without packing separately, and the 77mm front thread is standard enough that filter sharing across your kit is straightforward. Weather-resistant construction means it holds up in the kind of conditions where the interesting shots actually happen.

Who It's For

Wildlife photographers tracking fast-moving subjects will appreciate the ring-type USM's acquisition speed and the 11.5-foot minimum focus distance that lets you work closer than most telephotos of this length allow. Sports shooters working sidelines or track events get a compact, manageable telephoto prime without the weight penalty of a f/4 zoom. Bird photographers mounting this on an APS-C body gain an effective 640mm reach that suits open fields and coastal flats. Travel photographers who want true telephoto reach without checking a bag will find the size-to-focal-length ratio difficult to beat.

Key Features

• 400mm prime with fluorite and Super UD glass elements controlling chromatic aberration
• Ring-type USM autofocus with full-time manual focus override
• Super Spectra Coating for flare and ghosting control in backlight
• Internal focusing design keeps barrel length fixed
• Built-in lens hood included and integrated
• 77mm filter thread compatible with standard accessories
• Weather-resistant L-Series construction
• 8 elements in 6 groups optical formula

FAQ

What makes the 400mm f/5.6L hold up optically compared to modern telephotos?

The fluorite and Super UD glass elements control chromatic aberration across the spectrum, and Super Spectra Coating handles flare in backlit work where wildlife and sports shooters spend most of their time. The optical formula hasn't needed replacement because it works.

Is this lens stabilized?

No. You'll need either a fast shutter speed or tripod/monopod setup - the trade-off for the lens's compact size and weight relative to its reach.

How fast is the autofocus?

The ring-type USM motor is quiet and responsive with full-time manual override, so you can adjust focus without switching modes. It's not designed for rapid subject tracking like modern sports lenses, but it handles deliberate focus pulls cleanly.

What's the effective focal length on an APS-C body?

640mm equivalent, which puts serious reach in your hands without the bulk and weight of a longer prime. That's the working length for most bird and distant wildlife work.

Can you use filters and a tripod collar with this lens?

The 77mm filter thread is standard for filter stacking and polarizers. The lens doesn't have a built-in tripod collar, so you'll need to support it through the camera body or use a lens support arm if shooting handheld becomes fatiguing.

How close can you focus?

11.5 feet minimum, with 0.12x maximum magnification. This is a reach lens, not a macro tool - it's built for distant subjects.

Does the built-in hood stay attached?

Yes. The integrated hood stays mounted and ready, no packing or unpacking before shooting. The 77mm front thread sits in front of the hood for filter access.