Quick answer
The Samyang 21mm f/1.4 ED AS UMC CS is a ultra-wide prime lens covering 21mm at f/1.4 for the Canon EF mount. Its very wide maximum aperture suits low light and shallow depth of field with strong background blur.
About this lens
This 21mm f/1.4 fast wide-angle prime lens from Samyang fits Canon EF mount cameras, with extra-low dispersion glass and aspherical elements. The wide view suits landscapes, architecture and environmental shots.
Samyang 21mm f/1.4 ED AS UMC CS specifications
- Brand
- Samyang
- Mount
- Canon EF
- Focal length
- 21mm
- Maximum aperture
- f/1.4
- Lens type
- Prime
- Optical construction
- 8 elements in 7 groups
- Minimum focus distance
- 0.28 m
- Filter thread
- 58 mm
Specification source: lksamyang.com
What can you shoot with the Samyang 21mm f/1.4 ED AS UMC CS?
At 21mm this is a ultra-wide prime, which typically suits:
- Landscapes and big skies
- Architecture and interiors
- Astrophotography and night skies
Its very wide maximum aperture suits low light and shallow depth of field with strong background blur.
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 | 21mm | 81.2° | 91.7° |
| APS-C | 1.6x | 34mm | 56.4° | 65.6° |
Frequently asked questions
What mount does the Samyang 21mm f/1.4 ED AS UMC CS use?
It uses the Canon EF mount, so it fits Canon EF cameras directly.
What is the focal length of the Samyang 21mm f/1.4 ED AS UMC CS?
It is a fixed 21mm lens with a maximum aperture of f/1.4. That makes it a ultra-wide lens.
Is the Samyang 21mm f/1.4 ED AS UMC CS a prime or a zoom lens?
It is a prime lens with a fixed 21mm focal length. Primes usually open wider than zooms; this one opens to f/1.4.
What is the Samyang 21mm f/1.4 ED AS UMC CS equivalent on a crop sensor?
On APS-C (1.6x crop) it frames like 34mm on full frame, with a 56.4° horizontal and 65.6° diagonal field of view. These figures are calculated from the focal length and crop factor.
Which cameras does the Samyang 21mm f/1.4 ED AS UMC CS 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.
