Compare Pentax-DA 20-40mm F2.8-4 vs Pentax-DA 10-17mm F3.5-4.5 vs PENTAX-D FA 15-30mm F2.8
Construction
Aperture Blades
9 blades, Rounded aperture
6 blades
9 blades
Colors
Black, silver
Black
Black
Form Factor
Standard Zoom Lens
Ultra Wide-Angle Zoom Lens
Ultra Wide-Angle Zoom Lens
Image Size
APS-C
APS-C
Full-Frame
Lens Barrel
Distance scale, DoF scale
Distance scale
Distance scale
Lens Mount
Pentax K-mount
Pentax K-mount
Pentax K-mount
Material
Aluminium barrel
Motor
Micromotor
Screw drive from camera
Ultrasonic
Optical Formula | Elements
9 elements
10 elements
18 elements
Optical Formula | Groups
8 groups
8 groups
13 groups
Optical Formula | Special Glass
1 ED glass element, 1 SLD glass element, HD coating groups
ED element, HD + Super Protective coatings groups
Three ED and aspherical elements + HD and SP coatings groups
Dimensions
Filter Diameter
55 mm / 2.17 in
Size | Diameter
71 mm / 2.80 in
68 mm / 2.68 in
99 mm / 3.90 in
Size | Length
69 mm / 2.72 in
70 mm / 2.76 in
144 mm / 5.67 in
Weight
283 g / 10.00 oz
317 g / 11.20 oz
1040 g / 36.75 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)
180° Diagonal (wide) ~ 100° Diagonal
110.6° Diagonal | 100.4° Horizontal | 77.3° Vertical (wide) ~ 71.6° Diagonal | 61.9° Horizontal | 43.6° Vertical (tele)
Aperture
f/2.8–4 ~ f/22–32
f/3.5–4.5 ~ f/22–32
f/2.8 ~ f/22
Autofocus
Yes
Yes
Yes
Crop Factor
1.5
1.5
Focal Length
20 mm ~ 40 mm
10 mm ~ 17 mm
15 mm ~ 30 mm
Focal Length (35mm Equivalent)
30.0 mm ~ 60.0 mm
15.0 mm ~ 25.5 mm
Focus Type
Internal
Internal
Image Stabilization
No
No
Weather Resistance
Yes
No
Yes
Zoom Type
External zoom
External zoom
Performance
Max Magnification
0.2x
0.39x
0.2x
Min Focus Distance
280 mm / 11.02 in
140 mm / 5.51 in
280 mm / 11.02 in
Production
Accessory
Lens Hood: MH-RA55 (supplied)
Lens hood included
Lens hood included
Debut
2013-11-06
2019-07-08
2016-02-17
Reviews
Neofiliac score
50%
31%
31%
Pros
- Weather-sealed
- Beautiful construction for manual focusing
- Ultra-wide fisheye offers unique creative possibilities
- Constant f/2.8 aperture
- Great optical performance
- Weather-sealed
- Beautifully constructed
Cons
- External zoom without zoom lock
- Not the most interesting focal range
- Lacks front filter thread
- External zoom without zoom lock
- Lacks weather sealing
- Not the strongest optical performance
- Rather long
- On the heavy side
- Lacks front filter thread
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