Compare Sigma 18-300 F3.5-6.3 DC Macro vs Pentax-DA 20-40mm F2.8-4 vs Pentax DA 16-85mm F3.5-5.6
Construction
Aperture Blades
9 blades, Rounded aperture
7 blades, Rounded aperture
Colors
Black
Black, silver
Black
Form Factor
All-in-One 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
Aluminium barrel
Motor
Ultrasonic
Micromotor
Optical Formula | Elements
9 elements
16 elements
Optical Formula | Groups
8 groups
12 groups
Optical Formula | Special Glass
4 "F" low dispersion, 1 special low dispersion groups
1 ED glass element, 1 SLD glass element, HD coating groups
HD, Super Protect coatings groups
Dimensions
Filter Diameter
72 mm / 2.83 in
55 mm / 2.17 in
72 mm / 2.83 in
Size | Diameter
71 mm / 2.80 in
78 mm / 3.07 in
Size | Length
69 mm / 2.72 in
94 mm / 3.70 in
Weight
283 g / 10.00 oz
488 g / 17.24 oz
Function
Angle Of View
77.4° Diagonal | 67.4° Horizontal | 47.9° Vertical (wide) ~ 5.5° Diagonal | 4.6° Horizontal | 3.1° 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) ~ 19.3° Diagonal | 16.1° Horizontal | 10.8° Vertical (tele)
Aperture
f/3.5–6.3 ~ f/22
f/2.8–4 ~ f/22–32
f/3.5–5.6 ~ f/22–38
Autofocus
Yes
Yes
Yes
Crop Factor
1.5
1.5
1.5
Focal Length
18 mm ~ 300 mm
20 mm ~ 40 mm
16 mm ~ 85 mm
Focal Length (35mm Equivalent)
27.0 mm ~ 450.0 mm
30.0 mm ~ 60.0 mm
24.0 mm ~ 127.5 mm
Focus Type
Extending front
Extending front
Image Stabilization
Yes
No
No
Weather Resistance
No
Yes
Yes
Zoom Type
External zoom (zoom lock available)
External zoom
External zoom
Performance
Max Magnification
3x
0.2x
0.26x
Min Focus Distance
390 mm / 15.35 in
280 mm / 11.02 in
350 mm / 13.78 in
Production
Accessory
Lens hood included
Lens Hood: MH-RA55 (supplied)
Lens Hood: PR-RBA72 (supplied)
Debut
2014-09-12
2013-11-06
2014-10-29
Made In
Japan
Reviews
Neofiliac score
55%
50%
50%
Pros
- Very versatile focal range
- Optically stabilized
- Zoom lock prevents zoom creep
- High maximum magnification
- Weather-sealed
- Beautiful construction for manual focusing
- Weather-sealed
Cons
- All-in-one lenses tend to offer lower IQ
- Lacks weather sealing
- External zoom without zoom lock
- Not the most interesting focal range
- Not the best image quality
- Not the best build from Pentax
- External zoom without zoom lock
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