Compare Samyang 20mm F1.8 ED AS UMC vs Zeiss Planar T* 1.4/50 vs Zeiss Planar T* 1.4/85
Construction
Aperture Blades
7 blades
9 blades, 1/2 stop steps. ZE (Canon) version has no aperture ring.
9 blades, 1/2 stop steps. ZE (Canon) version has no aperture ring.
Form Factor
Ultra Wide-Angle Prime Lens
Normal Prime Lens
Short Telephoto 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
Canon EF-mount, Nikon F-mount, Pentax K-mount
Canon EF-mount, Nikon F-mount, Pentax K-mount
Optical Formula | Elements
13 elements
7 elements
6 elements
Optical Formula | Groups
12 groups
6 groups
5 groups
Optical Formula | Special Glass
Two aspherical + 3 ED elements, Ultra Multi Coating groups
Dimensions
Filter Diameter
77 mm / 3.03 in
58 mm / 2.28 in
72 mm / 2.83 in
Size | Diameter
83 mm / 3.27 in
66 mm / 2.60 in
78 mm / 3.07 in
Size | Length
88 mm / 3.46 in
69 mm / 2.72 in
85 mm / 3.35 in
Weight
497 g / 17.56 oz
350 g / 12.37 oz
700 g / 24.73 oz
Function
Angle Of View
94.5° Diagonal | 84.0° Horizontal | 61.9° Vertical
46.8° Diagonal | 39.6° Horizontal | 27.0° Vertical
28.6° Diagonal | 23.9° Horizontal | 16.1° Vertical
Aperture
f/1.8 ~ f/22
f/1.4 ~ f/16
f/1.4 ~ f/16
Autofocus
No
No
No
Focal Length
20 mm
50 mm
85 mm
Focus Type
Internal
Image Stabilization
No
No
No
Weather Resistance
No
No
Performance
Max Magnification
0.15
0.1
Min Focus Distance
200 mm / 7.87 in
450 mm / 17.72 in
1000 mm / 39.37 in
Production
Accessory
Lens hood included
Lens hood included
Lens hood included
Debut
2016-08-08
Reviews
Neofiliac score
59%
78%
93%
Pros
- Rather affordable
- Bright maximum aperture
- F-mount with physical aperture ring
- Bright maximum aperture
- F-mount with physical aperture ring
Cons
- Lacks weather sealing
- Not the highest grade of build
- Lacks weather sealing
- Classic rendering not to everyone's taste
- Classic rendering not to everyone's taste
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