Compare Pentax-DA 20-40mm F2.8-4 vs Pentax DA 55-300mm F4.0-5.8 vs Pentax DA 16-85mm F3.5-5.6
Construction
Aperture Blades
9 blades, Rounded aperture
6 blades
7 blades, Rounded aperture
Colors
Black, silver
Black
Black
Form Factor
Standard Zoom Lens
Super Telephoto Zoom Lens
Standard Zoom Lens
Image Size
APS-C
APS-C
APS-C
Lens Barrel
Distance scale, DoF scale
Distance scale
Lens Mount
Pentax K-mount
Pentax K-mount
Pentax K-mount
Material
Aluminium barrel
Motor
Micromotor
Screw drive from camera
Optical Formula | Elements
9 elements
12 elements
16 elements
Optical Formula | Groups
8 groups
8 groups
12 groups
Optical Formula | Special Glass
1 ED glass element, 1 SLD glass element, HD coating groups
ED glass elements groups
HD, Super Protect coatings groups
Dimensions
Filter Diameter
55 mm / 2.17 in
58 mm / 2.28 in
72 mm / 2.83 in
Size | Diameter
71 mm / 2.80 in
71 mm / 2.80 in
78 mm / 3.07 in
Size | Length
69 mm / 2.72 in
112 mm / 4.41 in
94 mm / 3.70 in
Weight
283 g / 10.00 oz
466 g / 16.47 oz
488 g / 17.24 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)
29.4° Diagonal | 24.6° Horizontal | 16.6° Vertical (wide) ~ 5.5° Diagonal | 4.6° Horizontal | 3.1° Vertical (tele)
84.1° Diagonal | 73.7° Horizontal | 53.1° Vertical (wide) ~ 19.3° Diagonal | 16.1° Horizontal | 10.8° Vertical (tele)
Aperture
f/2.8–4 ~ f/22–32
f/4–5.8 ~ 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
20 mm ~ 40 mm
55 mm ~ 300 mm
16 mm ~ 85 mm
Focal Length (35mm Equivalent)
30.0 mm ~ 60.0 mm
82.5 mm ~ 450.0 mm
24.0 mm ~ 127.5 mm
Focus Type
Extending front
Image Stabilization
No
No
No
Weather Resistance
Yes
Yes
Yes
Zoom Type
External zoom
External zoom
External zoom
Performance
Max Magnification
0.2x
0.28x
0.26x
Min Focus Distance
280 mm / 11.02 in
1400 mm / 55.12 in
350 mm / 13.78 in
Production
Accessory
Lens Hood: MH-RA55 (supplied)
Lens Hood: PH-RBI 58mm (supplied)
Lens Hood: PR-RBA72 (supplied)
Debut
2013-11-06
2013-10-07
2014-10-29
Reviews
Neofiliac score
50%
50%
50%
Pros
- Weather-sealed
- Beautiful construction for manual focusing
- Weather-sealed
- Great price for the price
- Weather-sealed
Cons
- External zoom without zoom lock
- Not the most interesting focal range
- Dark and variable maximum aperture
- External zoom without zoom lock
- Not the best from Pentax
- Not the best image quality
- Not the best build from Pentax
- External zoom without zoom lock
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