Quick answer
The Yongnuo YN40mm f/2.8 is a standard prime lens covering 40mm at f/2.8 for the Canon EF mount. Its bright maximum aperture handles indoor and evening light reasonably well.
About this lens
Yongnuo YN40mm f/2.8: a standard prime lens with a 40mm focal length and a maximum aperture of f/2.8, made for Canon EF mount cameras. The natural field of view suits street, documentary and everyday photography.
Yongnuo YN40mm f/2.8 specifications
What can you shoot with the Yongnuo YN40mm f/2.8?
At 40mm this is a standard prime, which typically suits:
- Everyday and street photography
- Natural-perspective portraits
- Documentary and travel work
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 | 40mm | 48.5° | 56.8° |
| APS-C | 1.6x | 64mm | 31.4° | 37.4° |
Frequently asked questions
What mount does the Yongnuo YN40mm f/2.8 use?
It uses the Canon EF mount, so it fits Canon EF cameras directly.
What is the focal length of the Yongnuo YN40mm f/2.8?
It is a fixed 40mm lens with a maximum aperture of f/2.8. That makes it a standard lens.
Is the Yongnuo YN40mm f/2.8 a prime or a zoom lens?
It is a prime lens with a fixed 40mm focal length. Primes usually open wider than zooms; this one opens to f/2.8.
What is the Yongnuo YN40mm f/2.8 equivalent on a crop sensor?
On APS-C (1.6x crop) it frames like 64mm on full frame, with a 31.4° horizontal and 37.4° diagonal field of view. These figures are calculated from the focal length and crop factor.
Which cameras does the Yongnuo YN40mm f/2.8 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.
