Compare Samyang 20mm F1.8 ED AS UMC vs Pentax DA 16-85mm F3.5-5.6 vs Pentax-DA 11-18mm F2.8
Construction
Aperture Blades
7 blades
7 blades, Rounded aperture
Colors
Black
Form Factor
Ultra Wide-Angle Prime Lens
Standard Zoom Lens
Ultra Wide-Angle Zoom Lens
Image Size
Full-Frame
APS-C
APS-C
Lens Barrel
Physical aperture ring, Distance scale
Distance 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
Optical Formula | Elements
13 elements
16 elements
Optical Formula | Groups
12 groups
12 groups
Optical Formula | Special Glass
Two aspherical + 3 ED elements, Ultra Multi Coating groups
HD, Super Protect coatings groups
Dimensions
Filter Diameter
77 mm / 3.03 in
72 mm / 2.83 in
Size | Diameter
83 mm / 3.27 in
78 mm / 3.07 in
Size | Length
88 mm / 3.46 in
94 mm / 3.70 in
Weight
497 g / 17.56 oz
488 g / 17.24 oz
Function
Angle Of View
94.5° Diagonal | 84.0° Horizontal | 61.9° Vertical
84.1° Diagonal | 73.7° Horizontal | 53.1° Vertical (wide) ~ 19.3° Diagonal | 16.1° Horizontal | 10.8° Vertical (tele)
105.4° Diagonal | 95.0° Horizontal | 72.1° Vertical (wide) ~ 77.4° Diagonal | 67.4° Horizontal | 47.9° Vertical (tele)
Aperture
f/1.8 ~ f/22
f/3.5–5.6 ~ f/22–38
f/2.8
Autofocus
No
Yes
Yes
Crop Factor
1.5
1.5
Focal Length
20 mm
16 mm ~ 85 mm
11 mm ~ 18 mm
Focal Length (35mm Equivalent)
24.0 mm ~ 127.5 mm
16.5 mm ~ 27.0 mm
Focus Type
Internal
Extending front
Image Stabilization
No
No
No
Weather Resistance
No
Yes
Zoom Type
External zoom
External zoom
Performance
Max Magnification
0.26x
Min Focus Distance
200 mm / 7.87 in
350 mm / 13.78 in
Production
Accessory
Lens hood included
Lens Hood: PR-RBA72 (supplied)
Lens hood included
Debut
2016-08-08
2014-10-29
2017-10-26
Reviews
Neofiliac score
59%
50%
40%
Pros
- Rather affordable
- Weather-sealed
- Good build quality
- Good center resolution
Cons
- Lacks weather sealing
- Not the highest grade of build
- Not the best image quality
- Not the best build from Pentax
- External zoom without zoom lock
- Lacks front filter thread
- Expensive for an APS-C wide-angle zoom
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