Compare Samyang 50mm F1.4 AS UMC vs Samyang 12mm F2.8 ED AS NCS Fisheye vs Pentax-FA 31mm F1.8
Construction
Aperture Blades
8 blades
7 blades, Circular blades
9 blades
Colors
Black
Black, silver
Form Factor
Normal Prime Lens
Ultra Wide-Angle Prime Lens
Wide-Angle Prime Lens
Image Size
Full-Frame
Full-Frame
Full-Frame
Lens Barrel
Physical aperture ring, Distance scale, DoF scale
Physical aperture ring, Distance scale
Physical aperture ring, Distance scale, DoF scale
Lens Mount
Canon EF-mount, Nikon F-mount, Pentax K-mount, Sony A-mount, Sony E-mount
Canon EF-mount, Nikon F-mount, Pentax K-mount, Sony A-mount, Sony E-mount
Pentax K-mount
Material
Aluminum
Motor
Screw drive from camera
Optical Formula | Elements
9 elements
12 elements
9 elements
Optical Formula | Groups
6 groups
8 groups
7 groups
Optical Formula | Special Glass
1 hybrid + 1 aspherical element, Ultra Multi Coating groups
2 aspherical, 3 ED, nano coating system groups
HD + Super Protect coatings groups
Dimensions
Filter Diameter
77 mm / 3.03 in
58 mm / 2.28 in
Size | Diameter
82 mm / 3.23 in
77 mm / 3.03 in
65 mm / 2.56 in
Size | Length
75 mm / 2.95 in
73 mm / 2.87 in
69 mm / 2.72 in
Weight
535 g / 18.90 oz
515 g / 18.20 oz
341 g / 12.05 oz
Function
Angle Of View
46.8° Diagonal | 39.6° Horizontal | 27.0° Vertical
180° Diagonal (fisheye)
69.9° Diagonal | 60.3° Horizontal | 42.3° Vertical
Aperture
f/1.4 ~ f/22
f/2.8 ~ f/22
f/1.8 ~ f/22
Autofocus
No
No
Yes
Focal Length
50 mm
12 mm
31 mm
Focus Type
Internal
Internal
Internal
Image Stabilization
No
No
No
Weather Resistance
No
No
No
Performance
Max Magnification
0.16x
Min Focus Distance
450 mm / 17.72 in
200 mm / 7.87 in
300 mm / 11.81 in
Production
Accessory
Lens hood included
Lens hood included
Lens hood included
Debut
2015-09-21
2014-11-01
2021-02-24
Reviews
Neofiliac score
59%
40%
50%
Pros
- Bright maximum aperture
- Beautiful rendering
- 180° FOV
- Reasonably good sunstar
- Comes with physical aperture ring
- Beautifully built
Cons
- Lacks weather sealing
- Not Samyang's highest grade of build
- Lacks front filter thread
- Lacks weather sealing
- Not the sharpest
- Only f/1.8 for the price
- Lacks weather sealing
- Unusual focal length
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