Compare Samyang 16mm F2 ED AS UMC CS vs Pentax DA 15mm F4 vs Pentax-FA 31mm F1.8
Construction
Aperture Blades
8 blades
9 blades, Rounded aperture diaphragm
9 blades
Colors
Black, Silver
Black, silver
Form Factor
Wide-Angle Prime Lens
Ultra Wide-Angle Prime Lens
Wide-Angle Prime Lens
Image Size
APS-C
APS-C
Full-Frame
Lens Barrel
Physical aperture ring, Distance scale
Distance scale, DoF scale
Physical aperture ring, Distance scale, DoF scale
Lens Mount
Canon EF-M-mount, Canon EF-mount, Micro Four Thirds-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
Metal barrel, metal mount
Aluminum
Motor
Screw drive from camera
Screw drive from camera
Optical Formula | Elements
13 elements
8 elements
9 elements
Optical Formula | Groups
11 groups
6 groups
7 groups
Optical Formula | Special Glass
1 ED glass element, 1 aspheric element, 1 hybrid aspheric element groups
1 Hybrid aspherical element, 1 ED glass element, High-grade multi-layer HD (High Definition) Coating groups
HD + Super Protect coatings groups
Dimensions
Filter Diameter
77 mm / 3.03 in
49 mm / 1.93 in
58 mm / 2.28 in
Size | Diameter
83 mm / 3.27 in
63 mm / 2.48 in
65 mm / 2.56 in
Size | Length
89 mm / 3.50 in
40 mm / 1.57 in
69 mm / 2.72 in
Weight
583 g / 20.60 oz
189 g / 6.68 oz
341 g / 12.05 oz
Function
Angle Of View
84.1° Diagonal | 73.7° Horizontal | 53.1° Vertical
87.8° Diagonal | 77.3° Horizontal | 56.1° Vertical
69.9° Diagonal | 60.3° Horizontal | 42.3° Vertical
Aperture
f/2 ~ f/22
f/4 ~ f/22
f/1.8 ~ f/22
Autofocus
No
Yes
Yes
Crop Factor
1.5
1.5
Focal Length
16 mm
15 mm
31 mm
Focal Length (35mm Equivalent)
24.0 mm
22.5 mm
Focus Type
Unit
Internal
Image Stabilization
No
No
No
Weather Resistance
No
Performance
Max Magnification
0.15x
0.16x
Min Focus Distance
200 mm / 7.87 in
180 mm / 7.09 in
300 mm / 11.81 in
Production
Accessory
Lens hood included
Lens Hood: built-in hood (supplied)
Lens hood included
Debut
2013-06-13
2013-08-27
2021-02-24
Reviews
Neofiliac score
50%
59%
50%
Pros
- A bit large for an APS-C lens
- Exceptionally light and compact
- Good weather resistance
- Comes with physical aperture ring
- Beautifully built
Cons
- Not the best grade of build
- Not the strongest IQ
- Not the highest IQ level
- Only f/1.8 for the price
- Lacks weather sealing
- Unusual focal length
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