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