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RF400mm F2.8 L IS USM

Super Telephoto

Item Code: 5053C002AA


High-performance, Wide-aperture 400mm f/2.8 Super-telephoto Lens, Exclusively for EOS R-series cameras

Inheriting the optics of the EF 400mm f/2.8L IS III USM, the same high image quality is maintained in the RF400mm F2.8 L IS USM with outstanding sharpness and contrast, center to corner, even at maximum aperture. A combination of Fluorite and Super UD (Ultra-low Dispersion) glass is at the heart of this lens’s outstanding optical performance. At the widest aperture of f/2.8, chromatic aberration is significantly reduced, to achieve tack-sharp images with minimal color fringing. This means detailed results in any shooting condition, particularly in low light levels.

Photo by Tyler Stableford, Canon Explorer of Light, using the RF400mm F2.8 L IS USM lens and Extender RF1.4x.

Optically Identical to EF 400mm f/2.8L IS III USM lens

The latest EF version of the 400mm f/2.8L IS lens, introduced in late 2018, preserved the legendary sharpness of previous EF 400mm f/2.8L lenses, but with a dramatic reduction in overall weight. The RF version, dedicated to EOS R-series cameras, preserves this advantage, providing outstanding handling for a super-telephoto lens with an f/2.8 maximum aperture. Numerous optical and mechanical steps combine for this supremely light weight, transforming the RF400mm F2.8L IS USM into a lens that’s equally at home in situations requiring mobility and portability — such as motorsports and wildlife — as it is fixed on home plate at a night baseball game. And, since it uses the same optical design as the EF version III lens, the same superb image quality can be expected.

Photo by Tyler Stableford, Canon Explorer of Light

Minimum Focusing Distance of 8.20 ft. / 2.5 m.

With a minimum focusing distance of approx. 8.2 ft./2.5m, the RF400mm F2.8 L IS USM helps you get close to your subjects. At its closest focus distance, users can fill the frame with a subject roughly the size of an adult’s extended hand, from wrist to fingertips.

Optical Image Stabilization with up to 5.5 Stops* of Shake Correction, Including Three IS Operation Modes

The RF400mm F2.8 L IS USM features an Optical Image Stabilizer system that provides up to 5.5 stops* of shake correction, delivering consistent and sharp results. Whether hand-held or mounted on a monopod (or other devices allowing mobile positioning), the lens’s Image Stabilization can deliver clear image detail in low-light situations or at lower ISOs. This applies when capturing both stills and video, for stable shooting, and sharp final imagery.

Three IS Operation Modes
Three image stabilization modes provide shake-correction for outstanding results in a wide range of shooting situations. These include traditional stabilization, with the correction visible any time IS is active in the camera’s viewfinder (IS Mode 1); helping to correct camera shake when intentionally panning horizontally (or vertically), providing shake-correction perpendicular to the photographer’s panning movement (IS Mode 2); and stabilization that instantly goes into effect only when the shutter is released — no correction visible between shots, in the camera’s viewfinder (IS Mode 3).

Super Spectra Coating (SSC) and Air Sphere Coating (ASC) Helps Minimize Ghosting and Flare

The RF400mm F2.8 L IS USM lens features Canon's Super Spectra Coating (SSC) that helps maintain overall image quality and color fidelity, as well as Air Sphere Coating (ASC), which significantly helps to reduce the occurrence of lens flare and ghosting. The RF400mm F2.8 L IS USM continues to deliver outstanding images and video, even at maximum aperture, in harsh back-lighting conditions.

Compatible with Canon RF 1.4x and 2x Extenders

To help get you even closer to the subject, attach the compatible Extender RF 1.4x or Extender RF2x to the RF400mm F2.8 L IS USM. Expand effective telephoto power to 560mm at f/4 with the Extender RF 1.4x, or to effective 800mm at f/5.6 using the Extender RF2x. The extenders allow even more telephoto reach when it’s needed, yet allow the user to convert back to an f/2.8 lens for low-light situations by simply removing the extender.

Customizable Electronic Focus Ring, with Manual Focus Capability during SERVO AF

The lens’s large manual focus ring is located directly on the lens barrel, and allows you to select from three different manual focus speed levels, to adjust the focus ring rotation to your desired preference. The “1” position on the M.Focus Speed switch provides the fastest sensitivity (a small amount of focus ring rotation provides significant focus change in the lens); settings 2 and 3 reduce this sensitivity, allowing for finer manual focus adjustments.. This can help whether you need a slow speed to switch between someone’s eyes in a distant profile, or a fast speed to dial in on different birds in a large, swiftly moving flock. Additionally, depending on camera settings, manual focus is still possible while AF is engaged, letting you fine tune focus adjustments to suit your shooting preferences.

9-blade Circular Aperture for Beautiful Bokeh

Thanks to its 9-blade, circular aperture, the RF400mm F2.8 L IS USM is capable of gorgeous, evocative out-of-focus areas and soft backgrounds. With rounded rendering of background blur, the 9-blade circular aperture helps create intimacy and intensity in both photos and videos for impactful results.

Two Focus Presets Available — Instantly Return to One or Two Memorized Focus Distances

Quickly select between one or two memorized focus distances, with focus presets. Especially useful for fixed-position sports photography, you can focus upon and memorize two separate focus distances. Then, with a simple twist of the playback ring, immediately jump back to one or the other. A sports photographer, for example, could easily pre-focus on home plate and 2nd base at a baseball game, with the ability to rapidly move focus back to either position with a slight turn of the playback ring on the lens barrel.

Photo by Tyler Stableford, Canon Explorer of Light, using the RF400mm F2.8 L IS USM lens and Extender RF2x.

Dust- and Water-resistant Design, with Fluorine Coating on Front Element for Easy Cleaning

Built to L series lens specifications, the RF400mm F2.8 L IS USM features a highly durable design for excellent performance even in inclement weather conditions. It delivers a dust- and water-resistant construction with seals around the mount, switches, rings and more. To help maintain a clean lens, even after multiple lens changes in sub-optimal conditions, the RF400mm F2.8 L IS USM has a specially designed fluorine coating on its front and rear surfaces. The coating helps to prevent water, oil and other surface residue like fingerprints from sticking to the lens, which facilitates quick and easy wiping, without the use of solvents.


Focal Length


Maximum and Minimum Aperture


Lens Mount Type

RF Mount Canon RF mount; Exclusively for Canon EOS R-series cameras

Minimum Focusing Distance

8.20 ft. / 2.5m

Maximum Magnification

0.17x (Fills frame with subject 7.9 x 5.3 inches / 202 x 135mm in size)

Angle of View

Diagonal: 06°10′

Lens Construction

17 elements in 13 groups

Special Elements

Two Fluorite, One Super UD

Lens Coating

Super Spectra, Fluorine (front & rear elements), ASC

Filter Size Diameter

Ø52 mm (Drop-in filter — Drop-in Screw-type Filter Holder 52 [WIII] included, with 52mm clear Protect Filter)

Aperture Blades


Dust/Water Resistance

Supported (Rubber ring on lens mount, focus/playback rings, switch panel and switches)

IS Mode Selection

Provided: mode 1, 2, 3

Optical Image Stabilization

CIPA standard: 5.5 stops (using an EOS R / EOS R5)

Maximum Outer Diameter x Length

Approx. 6.4 in x 14.4 in. / 163mm x 367mm


Approx. 6.37 lbs. (102 oz.) / 2890g

Lens hood

Long: ET-155 (WIII) (Bundled)
Short: ET-155B (Sold separately)

Lens Cap

E-180E (soft type) (bundled)

Dust Cap

Lens Dust Cap RF (Bundled)

Lens Case

LS400 Soft Case (Bundled)

Drop-in Filters

Canon Drop-in Circular Polarizing Filter 52 (WIII)
Canon Drop-in Gelatin Filter Holder 52 (WIII)

RF400mm F2.8 L IS USM

RF400mm F2.8 L IS USM
  • RF400mm F2.8 L IS USM
  • Lens Cap E-180E
  • Lens Dust Cap RF
  • Drop-in Screw Filter Holder 52(WIII) with 52mm Protect Filter
  • Lens Hood ET-155(WIII)
  • Lens Soft Case LS400
  • Lens Wide Strap B

Compatible Supplies & Accessories

Canon offers a wide range of compatible supplies and accessories that can enhance your user experience with you RF400mm F2.8 L IS USM that you can purchase direct. Scroll down to easily select items to add to your shopping cart for a faster, easier checkout. Visit the Canon Online Store



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Sample Images

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*ISO speed is based on recommended exposure index.

This is to make Misc appear on the page when needed.

MTF Charts

A Modulation Transfer Function (MTF) chart measures a lens’ expected optical performance at the center of the picture area and measures repeatedly along the diagonal line, further and further toward the corners of the image. The higher a curve is shown on the chart, the better the lens is performing in the area the chart is measuring. As a curve moves from left to right, it displays the lens' results from center towards the corners.

For more information on understanding how to read Canon Lens MTF charts, please click here.

This is to make Misc appear on the page when needed.


* Based on CIPA (Camera & Imaging Products Association) standards. Testing performed using the EOS R and R5 cameras.

† Prices and specifications subject to change without notice. Actual prices are determined by individual dealers and may vary.

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