Photo: Dinkun Chen (CC BY-SA 4.0)
RF 400mm F2.8 L IS USM
- 400mm
- f/2.8
- Prime
- Stabilized
- 2890 g
- Min focus 2.5 m
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Quick answer
Canon's super-telephoto prime with stabilization and f/2.8 maximum aperture, at about 2.9kg, introduced in 2021. It is lighter than the EF 400mm f/2.8L IS III and aimed at pro sports and wildlife.
Pros
- f/2.8 aperture
- Image stabilization
- About 2.9kg
- Takes RF extenders
Cons
- Large
- Needs a monopod or gimbal
- Minimum focus of 2.5m
Verdict
A current pro 400mm for RF, lighter than its EF predecessor.
About this lens
This 400mm f/2.8 telephoto prime lens from Canon fits Canon RF mount cameras, from the Canon L series with Image Stabilizer and ultrasonic-motor autofocus. It brings distant subjects closer for sports, wildlife and events.
Canon RF 400mm F2.8 L IS USM specifications
- Brand
- Canon
- Mount
- Canon RF
- Focal length
- 400mm
- Maximum aperture
- f/2.8
- Lens type
- Prime
- Format coverage
- full-frame
- Released
- 2021
- Optical construction
- 17 elements in 13 groups
- Aperture blades
- 9
- Image stabilization
- Yes
- Autofocus motor
- USM
- Minimum focus distance
- 2.5 m
- Maximum magnification
- 0.17x
- Weight
- 2890 g
- Length
- 367 mm
- Diameter
- 163 mm
Specification source: global.canon
What can you shoot with the Canon RF 400mm F2.8 L IS USM?
- Pro sports
- Wildlife
- Motorsport
Its bright maximum aperture handles indoor and evening light reasonably well.
Full-frame equivalent and field of view
Calculated from the focal length and crop factor. Not measured.
| Sensor | Crop | Equivalent | Horizontal FOV | Diagonal FOV |
|---|---|---|---|---|
| Full frame | 1.0x | 400mm | 5.2° | 6.2° |
| APS-C | 1.6x | 640mm | 3.2° | 3.9° |
Frequently asked questions
How heavy is the Canon RF 400mm F2.8 L IS USM?
About 2.89kg, lighter than the EF 400mm f/2.8L IS III at about 3.85kg.
Does the RF 400mm f/2.8 work with extenders?
Yes, Canon's RF 1.4x and 2x extenders are supported. Autofocus depends on the resulting aperture and camera body.
Is the RF 400mm f/2.8 weather sealed?
Yes, it is an L-series lens with dust and moisture resistance.
