Compare Samyang 20mm F1.8 ED AS UMC vs Fujifilm GF 23mm F4 vs Laowa 15mm f/4.5 Zero-D Shift
Construction
Aperture Blades
7 blades
9 blades, Rounded blades
5 blades
Form Factor
Ultra Wide-Angle Prime Lens
Ultra Wide-Angle Prime Lens
Ultra Wide-Angle Prime Lens
Image Size
Full-Frame
Medium Format (44x33)
Full-Frame
Lens Barrel
Physical aperture ring, Distance scale
Physical aperture ring
Physical aperture ring, Distance scale, DoF 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
Fujifilm G-mount
Canon EF-mount, Canon RF-mount, Nikon F-mount, Nikon Z-mount, Sony E-mount
Motor
Linear Motor
Optical Formula | Elements
13 elements
15 elements
17 elements
Optical Formula | Groups
12 groups
12 groups
11 groups
Optical Formula | Special Glass
Two aspherical + 3 ED elements, Ultra Multi Coating groups
2 aspherical, 3 extra-low dispersion, 1 super ED groups
Dimensions
Filter Diameter
77 mm / 3.03 in
82 mm / 3.23 in
Size | Diameter
83 mm / 3.27 in
90 mm / 3.54 in
79 mm / 3.11 in
Size | Length
88 mm / 3.46 in
103 mm / 4.06 in
103 mm / 4.06 in
Weight
497 g / 17.56 oz
845 g / 29.86 oz
597 g / 21.10 oz
Function
Angle Of View
94.5° Diagonal | 84.0° Horizontal | 61.9° Vertical
99.9° Diagonal
110.6° Diagonal | 100.4° Horizontal | 77.3° Vertical
Aperture
f/1.8 ~ f/22
f/4 ~ f/32
f/4.5 ~ f/22
Autofocus
No
Yes
No
Crop Factor
0.8
Focal Length
20 mm
23 mm
15 mm
Focal Length (35mm Equivalent)
18 mm
Focus Type
Internal
Internal
Internal
Image Stabilization
No
No
No
Weather Resistance
No
Yes
Performance
Max Magnification
0.09x
Min Focus Distance
200 mm / 7.87 in
380 mm / 14.96 in
200 mm / 7.87 in
Production
Accessory
Lens hood included
Lens hood included
Lens hood sold separately
Debut
2016-08-08
2017-04-19
2020-10-30
Made In
China
Reviews
Neofiliac score
59%
80%
31%
Pros
- Rather affordable
- Weather-sealed
- Comes with physical aperture ring
- Very sharp
- One of the widest lens with shift function
- Low vignetting
Cons
- Lacks weather sealing
- Not the highest grade of build
- Quite heavy
- Dark maximum aperture
- Dark maximum aperture
- Lacks front filter thread
- Lens hood not included
- Quite expensive
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