Compare Pentax-DA 20-40mm F2.8-4 vs Pentax-DA 55-300mm F4.5-6.3 vs Pentax-FA 77mm F1.8
Construction
Aperture Blades
9 blades, Rounded aperture
9 blades, Rounded blades
9 blades
Colors
Black, silver
Black
Black, silver
Form Factor
Standard Zoom Lens
Super Telephoto Zoom Lens
Short Telephoto Prime Lens
Image Size
APS-C
APS-C
Full-Frame
Lens Barrel
Distance scale, DoF scale
Physical aperture ring, Distance scale, DoF scale
Lens Mount
Pentax K-mount
Pentax K-mount
Pentax K-mount
Material
Aluminium barrel
Aluminum
Motor
Micromotor
Stepper motor
Screw drive from camera
Optical Formula | Elements
9 elements
14 elements
7 elements
Optical Formula | Groups
8 groups
11 groups
6 groups
Optical Formula | Special Glass
1 ED glass element, 1 SLD glass element, HD coating groups
ED elements + HD and SP coatings groups
HD + Super Protect coatings groups
Dimensions
Filter Diameter
55 mm / 2.17 in
58 mm / 2.28 in
49 mm / 1.93 in
Size | Diameter
71 mm / 2.80 in
77 mm / 3.03 in
64 mm / 2.52 in
Size | Length
69 mm / 2.72 in
89 mm / 3.50 in
48 mm / 1.89 in
Weight
283 g / 10.00 oz
471 g / 16.64 oz
270 g / 9.54 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)
31.4° Diagonal | 26.3° Horizontal | 17.7° Vertical
Aperture
f/2.8–4 ~ f/22–32
f/4.5–6.3 ~ f/22–32
f/1.8 ~ f/22
Autofocus
Yes
Yes
Yes
Crop Factor
1.5
1.5
Focal Length
20 mm ~ 40 mm
55 mm ~ 300 mm
77 mm
Focal Length (35mm Equivalent)
30.0 mm ~ 60.0 mm
82.5 mm ~ 450.0 mm
Focus Type
Extending front
Internal
Image Stabilization
No
No
No
Weather Resistance
Yes
Yes
No
Zoom Type
External zoom
External zoom
Performance
Max Magnification
0.2x
0.3x
0.14x
Min Focus Distance
280 mm / 11.02 in
950 mm / 37.40 in
700 mm / 27.56 in
Production
Accessory
Lens Hood: MH-RA55 (supplied)
Lens Hood: PH-RBK58 (supplied)
Lens hood included
Debut
2013-11-06
2016-06-08
2021-02-24
Reviews
Neofiliac score
50%
50%
68%
Pros
- Weather-sealed
- Beautiful construction for manual focusing
- Weather-sealed
- Very affordable for the reach it provides
- Rather compact
- Beautifully crafted
- Comes with physical aperture ring
- Good image quality
- Smooth rendering
Cons
- External zoom without zoom lock
- Not the most interesting focal range
- Dark maximum aperture
- External zoom without zoom lock
- Lacks weather sealing
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