Compare Pentax DA 16-85mm F3.5-5.6 vs Pentax-DA 20-40mm F2.8-4 vs Pentax DA 16-85mm F3.5-5.6
Construction
Aperture Blades
7 blades, Rounded aperture
9 blades, Rounded aperture
7 blades, Rounded aperture
Colors
Black
Black, silver
Black
Form Factor
Standard Zoom Lens
Standard Zoom Lens
Standard Zoom Lens
Image Size
APS-C
APS-C
APS-C
Lens Barrel
Distance scale, DoF scale
Lens Mount
Pentax K-mount
Pentax K-mount
Pentax K-mount
Material
Aluminium barrel
Motor
Micromotor
Optical Formula | Elements
16 elements
9 elements
16 elements
Optical Formula | Groups
12 groups
8 groups
12 groups
Optical Formula | Special Glass
HD, Super Protect coatings groups
1 ED glass element, 1 SLD glass element, HD coating groups
HD, Super Protect coatings groups
Dimensions
Filter Diameter
72 mm / 2.83 in
55 mm / 2.17 in
72 mm / 2.83 in
Size | Diameter
78 mm / 3.07 in
71 mm / 2.80 in
78 mm / 3.07 in
Size | Length
94 mm / 3.70 in
69 mm / 2.72 in
94 mm / 3.70 in
Weight
488 g / 17.24 oz
283 g / 10.00 oz
488 g / 17.24 oz
Function
Angle Of View
84.1° Diagonal | 73.7° Horizontal | 53.1° Vertical (wide) ~ 19.3° Diagonal | 16.1° Horizontal | 10.8° 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/3.5–5.6 ~ f/22–38
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
16 mm ~ 85 mm
20 mm ~ 40 mm
16 mm ~ 85 mm
Focal Length (35mm Equivalent)
24.0 mm ~ 127.5 mm
30.0 mm ~ 60.0 mm
24.0 mm ~ 127.5 mm
Focus Type
Extending front
Extending front
Image Stabilization
No
No
No
Weather Resistance
Yes
Yes
Yes
Zoom Type
External zoom
External zoom
External zoom
Performance
Max Magnification
0.26x
0.2x
0.26x
Min Focus Distance
350 mm / 13.78 in
280 mm / 11.02 in
350 mm / 13.78 in
Production
Accessory
Lens Hood: PR-RBA72 (supplied)
Lens Hood: MH-RA55 (supplied)
Lens Hood: PR-RBA72 (supplied)
Debut
2014-10-29
2013-11-06
2014-10-29
Reviews
Neofiliac score
50%
50%
50%
Pros
- Weather-sealed
- Weather-sealed
- Beautiful construction for manual focusing
- Weather-sealed
Cons
- Not the best image quality
- Not the best build from Pentax
- External zoom without zoom lock
- 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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