Compare Sigma 17-70mm F2.8-4 DC Macro vs Pentax DA 16-85mm F3.5-5.6 vs Pentax-DA* 16-50mm F2.8
Construction
Aperture Blades
7 blades, rounded
7 blades, Rounded aperture
9 blades
Colors
Black
Black
Form Factor
Standard Zoom Lens
Standard Zoom Lens
Standard Zoom Lens
Image Size
APS-C
APS-C
APS-C
Lens Barrel
Distance 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
Magnesium alloy
Motor
Micro-type ultrasonic
Stepper motor
Optical Formula | Elements
16 elements
16 elements
16 elements
Optical Formula | Groups
14 groups
12 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
HD, Super Protect coatings groups
ED + anomalous glass + aspherical elements, HD coating groups
Dimensions
Filter Diameter
72 mm / 2.83 in
72 mm / 2.83 in
77 mm / 3.03 in
Size | Diameter
79 mm / 3.11 in
78 mm / 3.07 in
84 mm / 3.31 in
Size | Length
82 mm / 3.23 in
94 mm / 3.70 in
117 mm / 4.61 in
Weight
465 g / 16.43 oz
488 g / 17.24 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)
84.1° Diagonal | 73.7° Horizontal | 53.1° Vertical (wide) ~ 19.3° Diagonal | 16.1° Horizontal | 10.8° 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/3.5–5.6 ~ f/22–38
f/2.8 ~ f/22
Autofocus
Yes
Yes
Yes
Crop Factor
1.5
1.5
1.5
Focal Length
17 mm ~ 70 mm
16 mm ~ 85 mm
16 mm ~ 50 mm
Focal Length (35mm Equivalent)
25.5 mm ~ 105.0 mm
24.0 mm ~ 127.5 mm
24.0 mm ~ 75.0 mm
Focus Type
Internal
Extending front
Internal
Image Stabilization
Yes
No
No
Weather Resistance
Yes
Yes
Zoom Type
External zoom
External zoom
External zoom
Performance
Max Magnification
0.36x
0.26x
0.24x
Min Focus Distance
220 mm / 8.66 in
350 mm / 13.78 in
300 mm / 11.81 in
Production
Accessory
Lens Hood: LH780-03 (supplied)
Lens Hood: PR-RBA72 (supplied)
Lens Hood: PH-RBN77 (sold separately)
Debut
2012-09-17
2014-10-29
2021-07-14
Made In
Japan
Reviews
Neofiliac score
65%
50%
40%
Pros
- Optically stabilized
- Rather good resolution
- Weather-sealed
- Weather-sealed
- Solid build quality
Cons
- External zoom without zoom lock
- Merely 0.36x maximum magnification despite named "Macro"
- Not the best image quality
- Not the best build from Pentax
- External zoom without zoom lock
- Exterior designed like a 1990's lens
- External zoom without zoom lock
- Lens hood not included
- Expensive for APS-C
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