Compare Samyang 20mm F1.8 ED AS UMC vs ZEISS Ventum 21 vs 7Artisans 18mm F6.3
Construction
Aperture Blades
7 blades
N/A
Colors
Black
Form Factor
Ultra Wide-Angle Prime Lens
Fixed focus lens, Prime lens, Pancake lens
Image Size
Full-Frame
Full-frame
APS-C
Lens Barrel
Physical aperture ring, 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
E-mount
E-mount, X-mount, EF-M-mount, Micro Four Thirds
Optical Formula | Elements
13 elements
11 elements
6 elements
Optical Formula | Groups
12 groups
9 groups
4 groups
Optical Formula | Special Glass
Two aspherical + 3 ED elements, Ultra Multi Coating groups
Dimensions
Filter Diameter
77 mm / 3.03 in
52 mm
N/A
Size | Diameter
83 mm / 3.27 in
62 mm
Size | Length
88 mm / 3.46 in
67.8 mm
Weight
497 g / 17.56 oz
227 g
49 g
Function
Angle Of View
94.5° Diagonal | 84.0° Horizontal | 61.9° Vertical
91°
74°
Aperture
f/1.8 ~ f/22
F/2.8 - f/22
F/6.3 fixed-aperture
Autofocus
No
Focal Length
20 mm
21 mm
18 mm
Focal Length (35mm Equivalent)
27 mm
Focus Type
Internal
Image Stabilization
No
N/A
Misc
Focus Fixed at infinity
Weather Resistance
No
Dust, moisture
Performance
Max Magnification
1x
Min Focus Distance
200 mm / 7.87 in
Fixed focus
Production
Accessory
Lens hood included
Debut
2016-08-08
2019-04-30
2020-11
Made In
China
Reviews
Neofiliac score
59%
Pros
- Rather affordable
- Can be used as a body cap
- Good contrast
- Good color rendition
Cons
- Lacks weather sealing
- Not the highest grade of build
- Not suitable for distant subjects
- Vignetting in video
- Fixed aperture
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