Quick answer
The Canon EF 400mm f/5.6L USM + 1.4x extender is a super telephoto prime lens covering 400mm at f/400.0 for the Canon EF mount. Its smaller maximum aperture favours daylight shooting and keeps the lens compact.
About this lens
A 400mm f/5.6 telephoto prime lens, the Canon EF 400mm f/5.6L USM + 1.4x extender is designed for Canon EF mount bodies, from the Canon L series with ultrasonic-motor autofocus. A light, non-stabilized L-series super-telephoto popular for birds and aviation.
Canon EF 400mm f/5.6L USM + 1.4x extender specifications
What can you shoot with the Canon EF 400mm f/5.6L USM + 1.4x extender?
At 400mm this is a super telephoto prime, which typically suits:
- Wildlife and birds
- Motorsport and field sports
- Distant subjects and the moon
Its smaller maximum aperture favours daylight shooting and keeps the lens compact.
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
What mount does the Canon EF 400mm f/5.6L USM + 1.4x extender use?
It uses the Canon EF mount, so it fits Canon EF cameras directly.
What is the focal length of the Canon EF 400mm f/5.6L USM + 1.4x extender?
It is a fixed 400mm lens with a maximum aperture of f/400.0. That makes it a super telephoto lens.
Is the Canon EF 400mm f/5.6L USM + 1.4x extender a prime or a zoom lens?
It is a prime lens with a fixed 400mm focal length. Primes usually open wider than zooms; this one opens to f/400.0.
What is the Canon EF 400mm f/5.6L USM + 1.4x extender equivalent on a crop sensor?
On APS-C (1.6x crop) it frames like 640mm on full frame, with a 3.2° horizontal and 3.9° diagonal field of view. These figures are calculated from the focal length and crop factor.
Which cameras does the Canon EF 400mm f/5.6L USM + 1.4x extender fit?
Any Canon EF-mount camera, including Canon EOS 1D X, Canon EOS 5D, Canon EOS 5D Mark II, Canon EOS 5D Mark III, and Canon EOS 5D Mark IV and 7 more.
Alternatives for Canon EF from other brands
All Canon EF lensesSame mount, overlapping focal range, closest maximum aperture first.
