Compare Pentax-DA 11-18mm F2.8 vs Pentax-DA 20-40mm F2.8-4 vs Pentax DA 16-85mm F3.5-5.6
Construction
Aperture Blades
9 blades, Rounded aperture
7 blades, Rounded aperture
Colors
Black, silver
Black
Form Factor
Ultra Wide-Angle Zoom Lens
Standard Zoom Lens
Standard Zoom Lens
Image Size
APS-C
APS-C
APS-C
Lens Barrel
Distance scale
Distance scale, DoF scale
Lens Mount
Pentax K-mount
Pentax K-mount
Pentax K-mount
Material
Aluminium barrel
Motor
Micromotor
Optical Formula | Elements
9 elements
16 elements
Optical Formula | Groups
8 groups
12 groups
Optical Formula | Special Glass
1 ED glass element, 1 SLD glass element, HD coating groups
HD, Super Protect coatings groups
Dimensions
Filter Diameter
55 mm / 2.17 in
72 mm / 2.83 in
Size | Diameter
71 mm / 2.80 in
78 mm / 3.07 in
Size | Length
69 mm / 2.72 in
94 mm / 3.70 in
Weight
283 g / 10.00 oz
488 g / 17.24 oz
Function
Angle Of View
105.4° Diagonal | 95.0° Horizontal | 72.1° Vertical (wide) ~ 77.4° Diagonal | 67.4° Horizontal | 47.9° Vertical (tele)
71.6° Diagonal | 61.9° Horizontal | 43.6° Vertical (wide) ~ 39.7° Diagonal | 33.4° Horizontal | 22.6° Vertical (tele)
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/2.8–4 ~ f/22–32
f/3.5–5.6 ~ f/22–38
Autofocus
Yes
Yes
Yes
Crop Factor
1.5
1.5
1.5
Focal Length
11 mm ~ 18 mm
20 mm ~ 40 mm
16 mm ~ 85 mm
Focal Length (35mm Equivalent)
16.5 mm ~ 27.0 mm
30.0 mm ~ 60.0 mm
24.0 mm ~ 127.5 mm
Focus Type
Extending front
Image Stabilization
No
No
No
Weather Resistance
Yes
Yes
Zoom Type
External zoom
External zoom
External zoom
Performance
Max Magnification
0.2x
0.26x
Min Focus Distance
280 mm / 11.02 in
350 mm / 13.78 in
Production
Accessory
Lens hood included
Lens Hood: MH-RA55 (supplied)
Lens Hood: PR-RBA72 (supplied)
Debut
2017-10-26
2013-11-06
2014-10-29
Reviews
Neofiliac score
40%
50%
50%
Pros
- Good build quality
- Good center resolution
- Weather-sealed
- Beautiful construction for manual focusing
- Weather-sealed
Cons
- Lacks front filter thread
- Expensive for an APS-C wide-angle zoom
- External zoom without zoom lock
- Not the most interesting focal range
- Not the best image quality
- Not the best build from Pentax
- External zoom without zoom lock
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