Compare Samyang 8mm F2.8 UMC Fisheye II vs Pentax-DA 10-17mm F3.5-4.5 vs Pentax DA 16-85mm F3.5-5.6
Construction
Aperture Blades
6 blades
6 blades
7 blades, Rounded aperture
Colors
Silver, black
Black
Black
Form Factor
Ultra Wide-Angle Prime Lens
Ultra Wide-Angle Zoom Lens
Standard Zoom Lens
Image Size
APS-C
APS-C
APS-C
Lens Barrel
Physical aperture ring, Distance scale
Distance scale
Lens Mount
Canon EF-M-mount, Fujifilm X-mount, Samsung NX-mount, Sony E-mount
Pentax K-mount
Pentax K-mount
Motor
Screw drive from camera
Optical Formula | Elements
11 elements
10 elements
16 elements
Optical Formula | Groups
8 groups
8 groups
12 groups
Optical Formula | Special Glass
2 aspherical + 3 ED, Ultra Multi Coating groups
ED element, HD + Super Protective coatings groups
HD, Super Protect coatings groups
Dimensions
Filter Diameter
72 mm / 2.83 in
Size | Diameter
60 mm / 2.36 in
68 mm / 2.68 in
78 mm / 3.07 in
Size | Length
65 mm / 2.56 in
70 mm / 2.76 in
94 mm / 3.70 in
Weight
265 g / 9.36 oz
317 g / 11.20 oz
488 g / 17.24 oz
Function
Angle Of View
180° Diagonal (fisheye)
180° Diagonal (wide) ~ 100° Diagonal
84.1° Diagonal | 73.7° Horizontal | 53.1° Vertical (wide) ~ 19.3° Diagonal | 16.1° Horizontal | 10.8° Vertical (tele)
Aperture
f/2.8 ~ f/22
f/3.5–4.5 ~ f/22–32
f/3.5–5.6 ~ f/22–38
Autofocus
No
Yes
Yes
Crop Factor
1.5
1.5
1.5
Focal Length
8 mm
10 mm ~ 17 mm
16 mm ~ 85 mm
Focal Length (35mm Equivalent)
12.0 mm
15.0 mm ~ 25.5 mm
24.0 mm ~ 127.5 mm
Focus Type
Internal
Internal
Extending front
Image Stabilization
No
No
Weather Resistance
No
No
Yes
Zoom Type
External zoom
External zoom
Performance
Max Magnification
0.39x
0.26x
Min Focus Distance
300 mm / 11.81 in
140 mm / 5.51 in
350 mm / 13.78 in
Production
Accessory
Lens hood included
Lens Hood: PR-RBA72 (supplied)
Debut
2014-03-21
2019-07-08
2014-10-29
Reviews
Neofiliac score
31%
31%
50%
Pros
- 180° FOV
- Reasonably well built
- Ultra-wide fisheye offers unique creative possibilities
- Weather-sealed
Cons
- Lacks front filter thread
- Lacks weather sealing
- Lacks front filter thread
- External zoom without zoom lock
- Lacks weather sealing
- Not the strongest optical performance
- Not the best image quality
- Not the best build from Pentax
- External zoom without zoom lock
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