Compare Samyang 20mm F1.8 ED AS UMC vs Pentax-FA 31mm F1.8 vs Pentax-FA 43mm F1.9
Construction
Aperture Blades
7 blades
9 blades
8 blades
Colors
Black, silver
Black, silver
Form Factor
Ultra Wide-Angle Prime Lens
Wide-Angle Prime Lens
Normal 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
Pentax K-mount
Pentax K-mount
Material
Aluminum
Aluminum
Motor
Screw drive from camera
Screw drive from camera
Optical Formula | Elements
13 elements
9 elements
7 elements
Optical Formula | Groups
12 groups
7 groups
6 groups
Optical Formula | Special Glass
Two aspherical + 3 ED elements, Ultra Multi Coating groups
HD + Super Protect coatings groups
HD + Super Protect coatings groups
Dimensions
Filter Diameter
77 mm / 3.03 in
58 mm / 2.28 in
49 mm / 1.93 in
Size | Diameter
83 mm / 3.27 in
65 mm / 2.56 in
64 mm / 2.52 in
Size | Length
88 mm / 3.46 in
69 mm / 2.72 in
27 mm / 1.06 in
Weight
497 g / 17.56 oz
341 g / 12.05 oz
155 g / 5.48 oz
Function
Angle Of View
94.5° Diagonal | 84.0° Horizontal | 61.9° Vertical
69.9° Diagonal | 60.3° Horizontal | 42.3° Vertical
53.4° Diagonal | 45.4° Horizontal | 31.2° Vertical
Aperture
f/1.8 ~ f/22
f/1.8 ~ f/22
f/1.9 ~ f/22
Autofocus
No
Yes
Yes
Focal Length
20 mm
31 mm
43 mm
Focus Type
Internal
Internal
Internal
Image Stabilization
No
No
No
Weather Resistance
No
No
No
Performance
Max Magnification
0.16x
0.12x
Min Focus Distance
200 mm / 7.87 in
300 mm / 11.81 in
450 mm / 17.72 in
Production
Accessory
Lens hood included
Lens hood included
Lens hood included
Debut
2016-08-08
2021-02-24
2021-02-24
Reviews
Neofiliac score
59%
50%
68%
Pros
- Rather affordable
- Comes with physical aperture ring
- Beautifully built
- Compact and lightweight
- Comes with physical aperture ring
Cons
- Lacks weather sealing
- Not the highest grade of build
- Only f/1.8 for the price
- Lacks weather sealing
- Unusual focal length
- Lacks weather sealing
- Expensive for a pancake lens
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