Compare Samyang 21mm F1.4 ED AS UMC CS vs Samyang 20mm F1.8 ED AS UMC vs Canon EF-S 10-18mm F4.5–5.6
Construction
Aperture Blades
9 blades, Circular blades
7 blades
7 blades
Colors
Black
Form Factor
Wide-Angle Prime Lens
Ultra Wide-Angle Prime Lens
Ultra Wide-Angle Zoom Lens
Image Size
APS-C
Full-Frame
APS-C
Lens Barrel
Physical aperture ring, Distance scale, DoF scale
Physical aperture ring, Distance scale
Lens Mount
Canon EF-M-mount, Fujifilm X-mount, Micro Four Thirds-mount, Sony E-mount
Canon EF-mount, Canon EF-M-mount, Fujifilm X-mount, Micro Four Thirds-mount, Nikon F-mount, Pentax K-mount, Samsung NX-mount, Sony A-mount, Sony E-mount
Canon EF-mount
Motor
Stepper motor
Optical Formula | Elements
8 elements
13 elements
14 elements
Optical Formula | Groups
7 groups
12 groups
11 groups
Optical Formula | Special Glass
3 aspherical and 2 ED elements + Ultra Multi Coating groups
Two aspherical + 3 ED elements, Ultra Multi Coating groups
UD lens element and enhanced lens coatings groups
Dimensions
Filter Diameter
58 mm / 2.28 in
77 mm / 3.03 in
67 mm / 2.64 in
Size | Diameter
64 mm / 2.52 in
83 mm / 3.27 in
75 mm / 2.95 in
Size | Length
68 mm / 2.68 in
88 mm / 3.46 in
72 mm / 2.83 in
Weight
275 g / 9.72 oz
497 g / 17.56 oz
240 g / 8.48 oz
Function
Angle Of View
69.0° Diagonal | 59.5° Horizontal | 41.7° Vertical
94.5° Diagonal | 84.0° Horizontal | 61.9° Vertical
107.1° Diagonal | 96.7° Horizontal | 73.7° Vertical (wide) ~ 73.9° Diagonal | 64.0° Horizontal | 45.2° Vertical (tele)
Aperture
f/1.4 ~ f/22
f/1.8 ~ f/22
f/4.5–5.6 ~ f/22–29
Autofocus
No
No
Yes
Crop Factor
1.5
1.6
Focal Length
21 mm
20 mm
10 mm ~ 18 mm
Focal Length (35mm Equivalent)
31.5 mm
16.0 mm ~ 28.8 mm
Focus Type
Internal
Internal
Internal
Image Stabilization
No
No
Yes
Weather Resistance
No
No
No
Zoom Type
Internal zoom
Performance
Max Magnification
0.15x
Min Focus Distance
280 mm / 11.02 in
200 mm / 7.87 in
220 mm / 8.66 in
Production
Accessory
Lens hood included
Lens hood included
Lens Hood: EW-73 C (sold separately)
Debut
2015-09-21
2016-08-08
2014-05-13
Reviews
Neofiliac score
50%
59%
62%
Pros
- Bright maximum aperture
- Very sharp
- Good color rendition
- Rather affordable
- Optically stabilized
- Light in the hand
- Internal zoom
Cons
- Lacks weather sealing
- Lacks weather sealing
- Not the highest grade of build
- Dark maximum aperture
- Lens hood not included
- Lacks weather sealing
- Not the best build quality
- Not the sharpest
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