Compare Pentax-DA 20-40mm F2.8-4 vs Pentax-DA* 16-50mm F2.8 vs Pentax-D FA 24-70mm F2.8
Construction
Aperture Blades
9 blades, Rounded aperture
9 blades
9 blades
Colors
Black, silver
Black
Black
Form Factor
Standard Zoom Lens
Standard Zoom Lens
Standard Zoom Lens
Image Size
APS-C
APS-C
Full-Frame
Lens Barrel
Distance scale, DoF scale
Distance scale
Lens Mount
Pentax K-mount
Pentax K-mount
Pentax K-mount
Material
Aluminium barrel
Magnesium alloy
Motor
Micromotor
Stepper motor
Ultrasonic
Optical Formula | Elements
9 elements
16 elements
17 elements
Optical Formula | Groups
8 groups
10 groups
12 groups
Optical Formula | Special Glass
1 ED glass element, 1 SLD glass element, HD coating groups
ED + anomalous glass + aspherical elements, HD coating groups
Three ED + four aspherical elements + HD Coating groups
Dimensions
Filter Diameter
55 mm / 2.17 in
77 mm / 3.03 in
82 mm / 3.23 in
Size | Diameter
71 mm / 2.80 in
84 mm / 3.31 in
89 mm / 3.50 in
Size | Length
69 mm / 2.72 in
117 mm / 4.61 in
110 mm / 4.33 in
Weight
283 g / 10.00 oz
712 g / 25.16 oz
787 g / 27.81 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) ~ 32.2° Diagonal | 27.0° Horizontal | 18.2° Vertical (tele)
84.1° Diagonal | 73.7° Horizontal | 53.1° Vertical (wide) ~ 34.4° Diagonal | 28.8° Horizontal | 19.5° Vertical (tele)
Aperture
f/2.8–4 ~ f/22–32
f/2.8 ~ f/22
f/2.8 ~ f/22
Autofocus
Yes
Yes
Yes
Crop Factor
1.5
1.5
Focal Length
20 mm ~ 40 mm
16 mm ~ 50 mm
24 mm ~ 70 mm
Focal Length (35mm Equivalent)
30.0 mm ~ 60.0 mm
24.0 mm ~ 75.0 mm
Focus Type
Internal
Internal
Image Stabilization
No
No
No
Weather Resistance
Yes
Yes
Yes
Zoom Type
External zoom
External zoom
Performance
Max Magnification
0.2x
0.24x
0.2x
Min Focus Distance
280 mm / 11.02 in
300 mm / 11.81 in
380 mm / 14.96 in
Production
Accessory
Lens Hood: MH-RA55 (supplied)
Lens Hood: PH-RBN77 (sold separately)
Lens Hood: PH-RBD82 (supplied)
Debut
2013-11-06
2021-07-14
2015-09-24
Reviews
Neofiliac score
50%
40%
59%
Pros
- Weather-sealed
- Beautiful construction for manual focusing
- Weather-sealed
- Solid build quality
- Weather-sealed
- Good autofocus performance
- Well priced for f/2.8 standard zoom
Cons
- External zoom without zoom lock
- Not the most interesting focal range
- Exterior designed like a 1990's lens
- External zoom without zoom lock
- Lens hood not included
- Expensive for APS-C
- Not as well built as newer Pentax lenses
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