Compare Sigma 17-70mm F2.8-4 DC Macro vs Pentax-DA 20-40mm F2.8-4 vs Pentax-DA* 16-50mm F2.8
Construction
Aperture Blades
7 blades, rounded
9 blades, Rounded aperture
9 blades
Colors
Black, silver
Black
Form Factor
Standard Zoom Lens
Standard Zoom Lens
Standard Zoom Lens
Image Size
APS-C
APS-C
APS-C
Lens Barrel
Distance scale
Distance scale, DoF scale
Lens Mount
Canon EF-mount, Nikon F-mount, Pentax K-mount, Sigma SA-mount, Sony A-mount
Pentax K-mount
Pentax K-mount
Material
Plastic barrel, metal mount
Aluminium barrel
Magnesium alloy
Motor
Micro-type ultrasonic
Micromotor
Stepper motor
Optical Formula | Elements
16 elements
9 elements
16 elements
Optical Formula | Groups
14 groups
8 groups
10 groups
Optical Formula | Special Glass
2 FLD ("F" Low Dispersion) glass elements, 1 SLD (Special Low Dispersion) glass element, 3 aspherical glass lenses including double sided aspherical lens groups
1 ED glass element, 1 SLD glass element, HD coating groups
ED + anomalous glass + aspherical elements, HD coating groups
Dimensions
Filter Diameter
72 mm / 2.83 in
55 mm / 2.17 in
77 mm / 3.03 in
Size | Diameter
79 mm / 3.11 in
71 mm / 2.80 in
84 mm / 3.31 in
Size | Length
82 mm / 3.23 in
69 mm / 2.72 in
117 mm / 4.61 in
Weight
465 g / 16.43 oz
283 g / 10.00 oz
712 g / 25.16 oz
Function
Angle Of View
80.7° Diagonal | 70.4° Horizontal | 50.4° Vertical (wide) ~ 23.3° Diagonal | 19.5° Horizontal | 13.0° Vertical (tele)
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)
Aperture
f/2.8–4 ~ f/22
f/2.8–4 ~ f/22–32
f/2.8 ~ f/22
Autofocus
Yes
Yes
Yes
Crop Factor
1.5
1.5
1.5
Focal Length
17 mm ~ 70 mm
20 mm ~ 40 mm
16 mm ~ 50 mm
Focal Length (35mm Equivalent)
25.5 mm ~ 105.0 mm
30.0 mm ~ 60.0 mm
24.0 mm ~ 75.0 mm
Focus Type
Internal
Internal
Image Stabilization
Yes
No
No
Weather Resistance
Yes
Yes
Zoom Type
External zoom
External zoom
External zoom
Performance
Max Magnification
0.36x
0.2x
0.24x
Min Focus Distance
220 mm / 8.66 in
280 mm / 11.02 in
300 mm / 11.81 in
Production
Accessory
Lens Hood: LH780-03 (supplied)
Lens Hood: MH-RA55 (supplied)
Lens Hood: PH-RBN77 (sold separately)
Debut
2012-09-17
2013-11-06
2021-07-14
Made In
Japan
Reviews
Neofiliac score
65%
50%
40%
Pros
- Optically stabilized
- Rather good resolution
- Weather-sealed
- Beautiful construction for manual focusing
- Weather-sealed
- Solid build quality
Cons
- External zoom without zoom lock
- Merely 0.36x maximum magnification despite named "Macro"
- 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
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