Compare Pentax-DA 20-40mm F2.8-4 vs Pentax-D FA 70-210mm F4 vs Pentax-DA 55-300mm F4.5-6.3
Construction
Aperture Blades
9 blades, Rounded aperture
9 blades
9 blades, Rounded blades
Colors
Black, silver
Black
Black
Form Factor
Standard Zoom Lens
Super Telephoto Zoom Lens
Super Telephoto Zoom Lens
Image Size
APS-C
APS-C
APS-C
Lens Barrel
Distance scale, DoF scale
Focus limiter, Distance scale
Lens Mount
Pentax K-mount
Pentax K-mount
Pentax K-mount
Material
Aluminium barrel
Magnesium alloy
Motor
Micromotor
Ring-type ultrasonic
Stepper motor
Optical Formula | Elements
9 elements
20 elements
14 elements
Optical Formula | Groups
8 groups
14 groups
11 groups
Optical Formula | Special Glass
1 ED glass element, 1 SLD glass element, HD coating groups
2 anomalous dispersion and 3 ED elements + HD coating groups
ED elements + HD and SP coatings groups
Dimensions
Filter Diameter
55 mm / 2.17 in
67 mm / 2.64 in
58 mm / 2.28 in
Size | Diameter
71 mm / 2.80 in
79 mm / 3.11 in
77 mm / 3.03 in
Size | Length
69 mm / 2.72 in
175 mm / 6.89 in
89 mm / 3.50 in
Weight
283 g / 10.00 oz
819 g / 28.94 oz
471 g / 16.64 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)
23.3° Diagonal | 19.5° Horizontal | 13.0° Vertical (wide) ~ 7.9° Diagonal | 6.5° Horizontal | 4.4° Vertical (tele)
29.4° Diagonal | 24.6° Horizontal | 16.6° Vertical (wide) ~ 5.5° Diagonal | 4.6° Horizontal | 3.1° Vertical (tele)
Aperture
f/2.8–4 ~ f/22–32
f/4 ~ f/32
f/4.5–6.3 ~ f/22–32
Autofocus
Yes
Yes
Yes
Crop Factor
1.5
1.5
1.5
Focal Length
20 mm ~ 40 mm
70 mm ~ 210 mm
55 mm ~ 300 mm
Focal Length (35mm Equivalent)
30.0 mm ~ 60.0 mm
105.0 mm ~ 315.0 mm
82.5 mm ~ 450.0 mm
Focus Type
Internal
Extending front
Image Stabilization
No
No
No
Weather Resistance
Yes
Yes
Yes
Zoom Type
External zoom
Internal zoom
External zoom
Performance
Max Magnification
0.2x
0.32x
0.3x
Min Focus Distance
280 mm / 11.02 in
950 mm / 37.40 in
950 mm / 37.40 in
Production
Accessory
Lens Hood: MH-RA55 (supplied)
Lens hood included
Lens Hood: PH-RBK58 (supplied)
Debut
2013-11-06
2020-01-22
2016-06-08
Reviews
Neofiliac score
50%
31%
50%
Pros
- Weather-sealed
- Beautiful construction for manual focusing
- Weather-sealed
- Beautifully built
- Very useful focal range
- Weather-sealed
- Very affordable for the reach it provides
Cons
- External zoom without zoom lock
- Not the most interesting focal range
- Dark maximum aperture
- Dark maximum aperture
- External zoom without zoom lock
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