Compare Samyang 20mm F1.8 ED AS UMC vs Tokina AT-X 14-20mm F2 Pro vs Canon EF-S 10-18mm F4.5–5.6
Construction
Aperture Blades
7 blades
9 blades
7 blades
Colors
Black
Form Factor
Ultra Wide-Angle Prime Lens
Wide-Angle Zoom Lens
Ultra Wide-Angle Zoom Lens
Image Size
Full-Frame
APS-C
APS-C
Lens Barrel
Physical aperture ring, Distance scale
Distance scale
Lens 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, Nikon F-mount
Canon EF-mount
Motor
Stepper motor
Optical Formula | Elements
13 elements
13 elements
14 elements
Optical Formula | Groups
12 groups
11 groups
11 groups
Optical Formula | Special Glass
Two aspherical + 3 ED elements, Ultra Multi Coating groups
2 super low dispersion + multilayer film coating groups
UD lens element and enhanced lens coatings groups
Dimensions
Filter Diameter
77 mm / 3.03 in
82 mm / 3.23 in
67 mm / 2.64 in
Size | Diameter
83 mm / 3.27 in
89 mm / 3.50 in
75 mm / 2.95 in
Size | Length
88 mm / 3.46 in
106 mm / 4.17 in
72 mm / 2.83 in
Weight
497 g / 17.56 oz
725 g / 25.62 oz
240 g / 8.48 oz
Function
Angle Of View
94.5° Diagonal | 84.0° Horizontal | 61.9° Vertical
91.7° Diagonal | 81.2° Horizontal | 59.5° Vertical (wide) ~ 71.6° Diagonal | 61.9° Horizontal | 43.6° Vertical (tele)
107.1° Diagonal | 96.7° Horizontal | 73.7° Vertical (wide) ~ 73.9° Diagonal | 64.0° Horizontal | 45.2° Vertical (tele)
Aperture
f/1.8 ~ f/22
f/2 ~ f/22
f/4.5–5.6 ~ f/22–29
Autofocus
No
Yes
Yes
Crop Factor
1.5
1.6
Focal Length
20 mm
14 mm ~ 20 mm
10 mm ~ 18 mm
Focal Length (35mm Equivalent)
21.0 mm ~ 30.0 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
Internal zoom
Performance
Max Magnification
0.12x
0.15x
Min Focus Distance
200 mm / 7.87 in
280 mm / 11.02 in
220 mm / 8.66 in
Production
Accessory
Lens hood included
Lens Hood: BH-823 (supplied)
Lens Hood: EW-73 C (sold separately)
Debut
2016-08-08
2015-12-28
2014-05-13
Reviews
Neofiliac score
59%
50%
62%
Pros
- Rather affordable
- Internal zoom
- Good image quality
- Optically stabilized
- Light in the hand
- Internal zoom
Cons
- Lacks weather sealing
- Not the highest grade of build
- Lacks weather sealing
- Very large and heavy for an APS-C lens
- Not as well built as some alternatives
- Dark maximum aperture
- Lens hood not included
- Lacks weather sealing
- Not the best build quality
- Not the sharpest
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