Compare Samyang 20mm F1.8 ED AS UMC vs Zeiss Distagon T* 2.8/15 ZM vs Zeiss Biogon T* 2.8/21 ZM
Construction
Aperture Blades
7 blades
Colors
Silver or black
Form Factor
Ultra Wide-Angle Prime Lens
Ultra Wide-Angle Prime Lens
Ultra Wide-Angle Prime Lens
Image Size
Full-Frame
Full-Frame
Full-Frame
Lens Barrel
Physical aperture ring, Distance scale
Physical aperture ring, Distance scale, DoF scale
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
Leica M-mount
Leica M-mount
Material
metal barrel, metal mount
metal barrel, metal mount
Optical Formula | Elements
13 elements
11 elements
9 elements
Optical Formula | Groups
12 groups
9 groups
7 groups
Optical Formula | Special Glass
Two aspherical + 3 ED elements, Ultra Multi Coating groups
1 aspherical element groups
Dimensions
Filter Diameter
77 mm / 3.03 in
72 mm / 2.83 in
46 mm / 1.81 in
Size | Diameter
83 mm / 3.27 in
78 mm / 3.07 in
53 mm / 2.09 in
Size | Length
88 mm / 3.46 in
92 mm / 3.62 in
75 mm / 2.95 in
Weight
497 g / 17.56 oz
550 g / 19.43 oz
280 g / 9.89 oz
Function
Angle Of View
94.5° Diagonal | 84.0° Horizontal | 61.9° Vertical
110.6° Diagonal | 100.4° Horizontal | 77.3° Vertical
91.7° Diagonal | 81.2° Horizontal | 59.5° Vertical
Aperture
f/1.8 ~ f/22
f/2.8 ~ f/22
f/2.8 ~ f/22
Autofocus
No
No
No
Focal Length
20 mm
15 mm
21 mm
Focus Type
Internal
Image Stabilization
No
No
No
Weather Resistance
No
Performance
Max Magnification
0.056
0.048
Min Focus Distance
200 mm / 7.87 in
300 mm / 11.81 in
500 mm / 19.69 in
Production
Accessory
Lens hood included
Lens hood included
Debut
2016-08-08
Made In
Germany
Reviews
Neofiliac score
59%
78%
78%
Pros
- Rather affordable
- Excellent build quality
- Still made in Germany
- Great build quality
- Good image quality
Cons
- Lacks weather sealing
- Not the highest grade of build
- Low maximum magnification
- Low maximum magnification
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