Compare Pentax-DA 20-40mm F2.8-4 vs Pentax DA 16-85mm F3.5-5.6 vs Pentax-DA* 16-50mm F2.8
Construction
Aperture Blades
9 blades, Rounded aperture
7 blades, Rounded aperture
9 blades
Colors
Black, silver
Black
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
Magnesium alloy
Motor
Micromotor
Stepper motor
Optical Formula | Elements
9 elements
16 elements
16 elements
Optical Formula | Groups
8 groups
12 groups
10 groups
Optical Formula | Special Glass
1 ED glass element, 1 SLD glass element, HD coating groups
HD, Super Protect coatings groups
ED + anomalous glass + aspherical elements, HD coating groups
Dimensions
Filter Diameter
55 mm / 2.17 in
72 mm / 2.83 in
77 mm / 3.03 in
Size | Diameter
71 mm / 2.80 in
78 mm / 3.07 in
84 mm / 3.31 in
Size | Length
69 mm / 2.72 in
94 mm / 3.70 in
117 mm / 4.61 in
Weight
283 g / 10.00 oz
488 g / 17.24 oz
712 g / 25.16 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)
84.1° Diagonal | 73.7° Horizontal | 53.1° Vertical (wide) ~ 19.3° Diagonal | 16.1° Horizontal | 10.8° Vertical (tele)
84.1° Diagonal | 73.7° Horizontal | 53.1° Vertical (wide) ~ 32.2° Diagonal | 27.0° Horizontal | 18.2° Vertical (tele)
Aperture
f/2.8–4 ~ f/22–32
f/3.5–5.6 ~ f/22–38
f/2.8 ~ f/22
Autofocus
Yes
Yes
Yes
Crop Factor
1.5
1.5
1.5
Focal Length
20 mm ~ 40 mm
16 mm ~ 85 mm
16 mm ~ 50 mm
Focal Length (35mm Equivalent)
30.0 mm ~ 60.0 mm
24.0 mm ~ 127.5 mm
24.0 mm ~ 75.0 mm
Focus Type
Extending front
Internal
Image Stabilization
No
No
No
Weather Resistance
Yes
Yes
Yes
Zoom Type
External zoom
External zoom
External zoom
Performance
Max Magnification
0.2x
0.26x
0.24x
Min Focus Distance
280 mm / 11.02 in
350 mm / 13.78 in
300 mm / 11.81 in
Production
Accessory
Lens Hood: MH-RA55 (supplied)
Lens Hood: PR-RBA72 (supplied)
Lens Hood: PH-RBN77 (sold separately)
Debut
2013-11-06
2014-10-29
2021-07-14
Reviews
Neofiliac score
50%
50%
40%
Pros
- Weather-sealed
- Beautiful construction for manual focusing
- Weather-sealed
- Weather-sealed
- Solid build quality
Cons
- 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
- Exterior designed like a 1990's lens
- External zoom without zoom lock
- Lens hood not included
- Expensive for APS-C
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