Compare Samyang 21mm F1.4 ED AS UMC CS vs Samyang 20mm F1.8 ED AS UMC vs Nikon 28mm F1.4E ED
Construction
Aperture Blades
9 blades, Circular blades
7 blades
9 blades
Colors
Black
Black
Form Factor
Wide-Angle Prime Lens
Ultra Wide-Angle Prime Lens
Wide-Angle Prime Lens
Image Size
APS-C
Full-Frame
Full-Frame
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
Nikon F-mount
Material
Magnesium alloy
Motor
Ring-type ultrasonic
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
3 aspherical + 2 ED element, Nano Crystal and fluorine coatings groups
Dimensions
Filter Diameter
58 mm / 2.28 in
77 mm / 3.03 in
77 mm / 3.03 in
Size | Diameter
64 mm / 2.52 in
83 mm / 3.27 in
83 mm / 3.27 in
Size | Length
68 mm / 2.68 in
88 mm / 3.46 in
101 mm / 3.98 in
Weight
275 g / 9.72 oz
497 g / 17.56 oz
645 g / 22.79 oz
Function
Angle Of View
69.0° Diagonal | 59.5° Horizontal | 41.7° Vertical
94.5° Diagonal | 84.0° Horizontal | 61.9° Vertical
75.4° Diagonal | 65.5° Horizontal | 46.4° Vertical
Aperture
f/1.4 ~ f/22
f/1.8 ~ f/22
f/1.4–16 ~ f/1.4–16
Autofocus
No
No
Yes
Crop Factor
1.5
Focal Length
21 mm
20 mm
28 mm
Focal Length (35mm Equivalent)
31.5 mm
Focus Type
Internal
Internal
Internal
Image Stabilization
No
No
No
Weather Resistance
No
No
Yes
Performance
Max Magnification
0.17x
Min Focus Distance
280 mm / 11.02 in
200 mm / 7.87 in
280 mm / 11.02 in
Production
Accessory
Lens hood included
Lens hood included
Debut
2015-09-21
2016-08-08
2017-05-31
Reviews
Neofiliac score
50%
59%
86%
Pros
- Bright maximum aperture
- Very sharp
- Good color rendition
- Rather affordable
- Bright maximum aperture
- Weather-sealed
- Excellent optical performance
- Natural perspective
Cons
- Lacks weather sealing
- Lacks weather sealing
- Not the highest grade of build
- Quite expensive
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