Compare Sigma 18-35mm F1.8 DC HSM vs Pentax-DA 20-40mm F2.8-4 vs Pentax-D FA 70-210mm F4
Construction
Aperture Blades
9 blades, Rounded diaphragm
9 blades, Rounded aperture
9 blades
Colors
Black, silver
Black
Form Factor
Zoom Lens
Standard Zoom Lens
Super Telephoto Zoom Lens
Image Size
APS-C
APS-C
APS-C
Lens Barrel
Distance scale
Distance scale, DoF scale
Focus limiter, 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
Aluminium barrel
Magnesium alloy
Motor
Ring-type ultrasonic
Micromotor
Ring-type ultrasonic
Optical Formula | Elements
17 elements
9 elements
20 elements
Optical Formula | Groups
12 groups
8 groups
14 groups
Optical Formula | Special Glass
5 SLD glass elements, 4 glassmold aspherical elements groups
1 ED glass element, 1 SLD glass element, HD coating groups
2 anomalous dispersion and 3 ED elements + HD coating groups
Dimensions
Filter Diameter
72 mm / 2.83 in
55 mm / 2.17 in
67 mm / 2.64 in
Size | Diameter
78 mm / 3.07 in
71 mm / 2.80 in
79 mm / 3.11 in
Size | Length
121 mm / 4.76 in
69 mm / 2.72 in
175 mm / 6.89 in
Weight
810 g / 28.62 oz
283 g / 10.00 oz
819 g / 28.94 oz
Function
Angle Of View
77.4° Diagonal | 67.4° Horizontal | 47.9° Vertical (wide) ~ 44.8° Diagonal | 37.8° Horizontal | 25.8° Vertical (tele)
71.6° Diagonal | 61.9° Horizontal | 43.6° Vertical (wide) ~ 39.7° Diagonal | 33.4° Horizontal | 22.6° Vertical (tele)
23.3° Diagonal | 19.5° Horizontal | 13.0° Vertical (wide) ~ 7.9° Diagonal | 6.5° Horizontal | 4.4° Vertical (tele)
Aperture
f/1.8 ~ f/16
f/2.8–4 ~ f/22–32
f/4 ~ f/32
Autofocus
Yes
Yes
Yes
Crop Factor
1.5
1.5
1.5
Focal Length
18 mm ~ 35 mm
20 mm ~ 40 mm
70 mm ~ 210 mm
Focal Length (35mm Equivalent)
27.0 mm ~ 52.5 mm
30.0 mm ~ 60.0 mm
105.0 mm ~ 315.0 mm
Focus Type
Internal
Internal
Image Stabilization
No
No
No
Weather Resistance
Yes
Yes
Zoom Type
Internal zoom
External zoom
Internal zoom
Performance
Max Magnification
0.23x
0.2x
0.32x
Min Focus Distance
280 mm / 11.02 in
280 mm / 11.02 in
950 mm / 37.40 in
Production
Accessory
Lens Hood: LH780-03 (supplied)
Lens Hood: MH-RA55 (supplied)
Lens hood included
Debut
2013-04-18
2013-11-06
2020-01-22
Made In
Japan
Reviews
Neofiliac score
65%
50%
31%
Pros
- Internal zoom
- High levels of resolution
- Weather-sealed
- Beautiful construction for manual focusing
- Weather-sealed
- Beautifully built
- Very useful focal range
Cons
- Rather large and heavy for an APS-C lens
- External zoom without zoom lock
- Not the most interesting focal range
- Dark maximum aperture
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