Compare Samyang 20mm F1.8 ED AS UMC vs Laowa 25mm f/2.8 2.5-5X Ultra Macro vs Canon RF 15-35mm F2.8
Construction
Aperture Blades
7 blades
8 blades
9 blades
Colors
Black
Black
Form Factor
Ultra Wide-Angle Prime Lens
Wide-Angle Prime Lens
Wide-Angle Zoom Lens
Image Size
Full-Frame
Full-Frame
Full-Frame
Lens Barrel
Physical aperture ring, Distance scale
Physical aperture ring
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, Canon RF-mount, Leica L-mount, Nikon F-mount, Nikon Z-mount, Pentax K-mount, Sony E-mount
Canon RF-mount
Material
Magnesium alloy
Motor
Nano ultrasonic
Optical Formula | Elements
13 elements
8 elements
16 elements
Optical Formula | Groups
12 groups
6 groups
12 groups
Optical Formula | Special Glass
Two aspherical + 3 ED elements, Ultra Multi Coating groups
1 low-dispersion element groups
3 aspherical + 2 UD elements groups
Dimensions
Filter Diameter
77 mm / 3.03 in
82 mm / 3.23 in
Size | Diameter
83 mm / 3.27 in
82 mm / 3.23 in
89 mm / 3.50 in
Size | Length
88 mm / 3.46 in
65 mm / 2.56 in
127 mm / 5.00 in
Weight
497 g / 17.56 oz
400 g / 14.13 oz
840 g / 29.68 oz
Function
Angle Of View
94.5° Diagonal | 84.0° Horizontal | 61.9° Vertical
81.8° Diagonal | 71.5° Horizontal | 51.3° Vertical
110.6° Diagonal | 100.4° Horizontal | 77.3° Vertical (wide) ~ 63.5° Diagonal | 54.4° Horizontal | 37.8° Vertical (tele)
Aperture
f/1.8 ~ f/22
f/2.8 ~ f/16
f/2.8
Autofocus
No
No
Yes
Focal Length
20 mm
25 mm
15 mm ~ 35 mm
Focus Type
Internal
Internal
Image Stabilization
No
No
Yes (5 stops)
Weather Resistance
No
No
Yes
Zoom Type
External zoom
Performance
Max Magnification
5x
0.21x
Min Focus Distance
200 mm / 7.87 in
170 mm / 6.69 in
280 mm / 11.02 in
Production
Accessory
Lens hood included
Lens hood sold separately
Lens hood included
Debut
2016-08-08
2018-03-07
2019-02-14
Made In
China
Reviews
Neofiliac score
59%
31%
71%
Pros
- Rather affordable
- Exceptional maximum magnification
- Optional LED ring light and tripod collar available
- 1mm wider than the EF-mount version
- Low distortion
- Unique image stabilization
- Weather-sealed
- Good sharpness
Cons
- Lacks weather sealing
- Not the highest grade of build
- Not stabilized
- No lens hood available
- Lacks weather sealing
- On the heavy side
- External zoom without zoom lock
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