Canon RF lens
Canon RF400mm F2.8 L IS USM
400 mm, f/2.8, made for full frame, stabilised. It mounts natively on 5 of our APS-C cameras; on the EOS R50 it frames like 640 mm.
- 400 mm · 640 mm equiv. on EOS R50
- f/2.8
- Drop-in filter
- 2,890 g
- Stabilised
- Weather-sealed
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On your camera
The view, the weight with the camera (battery and card included) and what the maker says about each pair. It is made for full-frame sensors and covers APS-C with room to spare.
| Camera | View (35 mm equiv.) | With the camera | Fit and maker's notes | Kit |
|---|---|---|---|---|
| Canon EOS R100 | 640 mm | 3,246 g | Fits and works | |
| Canon EOS R50 | 640 mm | 3,265 g | Fits and works | |
| Canon EOS R50 V | 640 mm | 3,260 g | Fits and works | |
| Canon EOS R10 | 640 mm | 3,319 g | Fits and works | |
| Canon EOS R7 | 640 mm | 3,502 g | Fits and works |
What it frames
At its closest (250 cm from the sensor) it fills the frame of the EOS R50 with a subject about 13 cm wide.
On the EOS R50, to scale
Other telephoto primes for Canon RF
The nearest in focal length, with the numbers that differ.
- Canon RF600mm F11 IS STM960 mm equiv. · f/11 · 930 g (−1960 g) · 82 mmCompare
- Canon RF600mm F4 L IS USM960 mm equiv. · f/4 · 3,090 g (+200 g) · Drop-in filterCompare
- Canon RF800mm F11 IS STM1280 mm equiv. · f/11 · 1,260 g (−1630 g) · 95 mmCompare
- Canon RF800mm F5.6 L IS USM1280 mm equiv. · f/5.6 · 3,140 g (+250 g) · Drop-in filterCompare
- Canon RF135mm F1.8 L IS USM216 mm equiv. · f/1.8 · 935 g (−1955 g) · 82 mmCompare
- Canon RF1200mm F8 L IS USM1920 mm equiv. · f/8 · 3,340 g (+450 g) · Drop-in filterCompare
Questions about this lens
Which cameras does the Canon RF400mm F2.8 L IS USM fit?
5 APS-C cameras in our catalogue: EOS R100, EOS R50, EOS R50 V, EOS R10, EOS R7. It is made for full frame, so it also fits the full-frame cameras on its mount.
What does it frame like on APS-C?
400 mm frames like 640 mm on the EOS R50 (1.6x).
What filter size does it take?
Drop-in filter.
Where these facts come from
Facts checked 9 Oct 2026 against the makers' specification pages. How we check
Size, weight, filter thread, close focus and magnification are Canon's published figures. We have not tested this lens; for image quality, read reviews from people who have.
Specifications
- Mount
- Canon RF
- Made for
- Full-frame sensors (covers APS-C too)
- Focal length
- 400 mm
- Maximum aperture
- f/2.8
- Lens stabilisation
- Yes
- Weather sealing
- Yes, per the maker
- Filter thread
- Drop-in filter
- Weight
- 2,890 g
- Size (diameter × length)
- 163 × 367 mm
- Closest focus
- 250 cm
- Maximum magnification
- 0.17x
- Autofocus
- Yes
- Announced
- 2021
- Note
- Drop-in filter