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Canon EF 400mm f/2.8L IS USM Lens

The Canon EF 400mm f/2.8L IS USM is a 400mm f/2.8 lens designed for Canon EF mount cameras. Check GearFocus for current availability, with buyer protection on every purchase.

Canon EF 400mm f/2.8L IS USM Lens

Canon EF 400mm f/2.8L IS USM Lens

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Lens Overview — Canon EF 400mm f/2.8L IS USM

The Canon EF 400mm f/2.8L IS USM Lens is a professional-grade prime telephoto lens built for Canon's EF mount system, designed to cover full-frame sensors. With a fixed 400mm focal length and a fast maximum aperture of f/2.8, this lens is well-suited to scenarios where a large amount of light needs to be gathered quickly — think sports sidelines, wildlife hides, or low-ambient-light environments where background separation is equally important. The lens supports both autofocus and manual focus operation, giving shooters flexibility depending on their shooting style or subject behavior.

Optical image stabilization is built in, helping to counteract camera shake at this demanding focal length. A 52mm filter thread provides compatibility with a range of drop-in filter accessories. Weighing in at 5,370g, this is unambiguously a serious, heavy piece of glass that will demand a sturdy support system — monopod or tripod use is essentially non-negotiable for most applications.

It is categorized as a telephoto prime within the full-frame DSLR lens family, making it compatible with Canon EF-mount camera bodies. For photographers who regularly shoot at distance and need consistent, fast aperture performance, this lens occupies a clear and well-defined role in a professional kit.

Key Features — Canon EF 400mm f/2.8L IS USM

400mm f/2.8 Prime: Fixed 400mm focal length with a fast f/2.8 maximum aperture delivers exceptional light-gathering and subject isolation at long distances.

Canon EF Full-Frame Mount: Canon EF mount provides compatibility with the full range of Canon full-frame and APS-C DSLR bodies.

Optical Image Stabilization: Built-in IS system helps counteract camera shake at 400mm, enabling sharper results in challenging handheld or supported shooting conditions.

Ring-Type USM Autofocus: Ultrasonic motor delivers fast, near-silent autofocus — critical for tracking unpredictable subjects in sports and wildlife photography.

Auto and Manual Focus: Full-time manual focus override allows precise focus adjustments without switching out of autofocus mode.

L-Series Construction: Canon's professional L-series build standard includes weather sealing and durable materials suited to demanding field conditions.

Lens Specifications — Canon EF 400mm f/2.8L IS USM

Canon EF 400mm f/2.8L IS USM full specifications
SpecDetail
Use CasesWildlife, Sports, Birding
Lens TypeSuper Telephoto
FormatFull Frame
Zoom/PrimePrime
Focal Length400mm
Maximum Aperturef/2.8
Camera SystemDSLR
Lens MountCanon EF
AutofocusYes
Focus TypeAuto, Manual
Image StabilizationOptical
Filter Thread52mm

Description — Canon EF 400mm f/2.8L IS USM

The Canon EF 400mm f/2.8L IS USM Lens is a prime telephoto lens built for Canon EF-mount DSLR cameras, with full coverage of full-frame sensors. It delivers a fixed 400mm focal length paired with a fast f/2.8 maximum aperture — a combination that makes it a go-to choice for photographers working at distance who also need strong light-gathering capability and subject isolation. Optical image stabilization is on board to help manage camera shake at this focal length, and the lens accommodates both autofocus and manual focus shooting modes. A 52mm filter thread is provided for accessory use.

At 5,370g, this lens demands a serious support setup and represents a dedicated investment for telephoto work. It is squarely aimed at professional or advanced shooters operating within the Canon EF ecosystem who require reliable, consistent performance at 400mm.

Pros — Canon EF 400mm f/2.8L IS USM

  • ✓Fast f/2.8 maximum aperture enables strong subject separation and light-gathering performance at 400mm
  • ✓Prime 400mm focal length delivers a dedicated telephoto reach for full-frame Canon EF-mount bodies
  • ✓Optical image stabilization helps reduce camera shake at this long focal length

Cons — Canon EF 400mm f/2.8L IS USM

  • ✗Weighs 5,370g, making handheld shooting for extended periods impractical without substantial support
  • ✗Fixed 400mm focal length offers no zoom flexibility — recomposing requires physically repositioning
  • ✗Compatible only with Canon EF-mount bodies, limiting cross-system usability

Reviews — Canon EF 400mm f/2.8L IS USM

Videos — Canon EF 400mm f/2.8L IS USM

Canon RF 400mm f/2.8 'L' IS USM lens review with samples — Christopher Frost

Frequently Asked Questions — Canon EF 400mm f/2.8L IS USM

Which camera mount does this lens use?+
This lens uses the Canon EF mount, making it compatible with Canon EF-mount DSLR cameras. It is designed to cover full-frame sensors.
Does this lens support autofocus?+
Yes, the lens supports both autofocus and manual focus operation. You can switch between the two depending on your shooting needs.
Does this lens have image stabilization?+
Yes, optical image stabilization is included, which helps reduce the impact of camera shake — a meaningful feature when shooting at 400mm.
How heavy is this lens, and will I need additional support?+
The lens weighs 5,370g. At that weight, a sturdy monopod or tripod is strongly recommended for comfortable and steady shooting.
What filter size does this lens use?+
The lens has a 52mm filter thread, which accommodates standard 52mm drop-in filter accessories.
Is this lens suitable for full-frame cameras?+
Yes, this lens is designed for full-frame sensors and is categorized as a full-frame format lens within the Canon EF ecosystem.

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