Compare Sigma 50mm F1.4 DG HSM vs Sigma 18-35mm F1.8 DC HSM vs Pentax DA 16-85mm F3.5-5.6
Construction
Aperture Blades
9 blades, Rounded diaphragm
9 blades, Rounded diaphragm
7 blades, Rounded aperture
Colors
Black
Form Factor
Normal Prime Lens
Zoom Lens
Standard Zoom Lens
Image Size
Full-Frame
APS-C
APS-C
Lens Barrel
Distance scale, DoF scale
Distance scale
Lens Mount
Canon EF-mount, Nikon F-mount, Sigma SA-mount, Sony A-mount, Sony E-mount, Leica L-mount
Canon EF-mount, Nikon F-mount, Pentax K-mount, Sigma SA-mount, Sony A-mount
Pentax K-mount
Motor
Ring-type ultrasonic
Ring-type ultrasonic
Optical Formula | Elements
13 elements
17 elements
16 elements
Optical Formula | Groups
8 groups
12 groups
12 groups
Optical Formula | Special Glass
SLD glass elements, aspheric elements groups
5 SLD glass elements, 4 glassmold aspherical elements groups
HD, Super Protect coatings groups
Dimensions
Filter Diameter
77 mm / 3.03 in
72 mm / 2.83 in
72 mm / 2.83 in
Size | Diameter
85 mm / 3.35 in
78 mm / 3.07 in
78 mm / 3.07 in
Size | Length
100 mm / 3.94 in
121 mm / 4.76 in
94 mm / 3.70 in
Weight
815 g / 28.80 oz
810 g / 28.62 oz
488 g / 17.24 oz
Function
Angle Of View
46.8° Diagonal | 39.6° Horizontal | 27.0° Vertical
77.4° Diagonal | 67.4° Horizontal | 47.9° Vertical (wide) ~ 44.8° Diagonal | 37.8° Horizontal | 25.8° Vertical (tele)
84.1° Diagonal | 73.7° Horizontal | 53.1° Vertical (wide) ~ 19.3° Diagonal | 16.1° Horizontal | 10.8° Vertical (tele)
Aperture
f/1.4 ~ f/16
f/1.8 ~ f/16
f/3.5–5.6 ~ f/22–38
Autofocus
Yes
Yes
Yes
Crop Factor
1.5
1.5
Focal Length
50 mm
18 mm ~ 35 mm
16 mm ~ 85 mm
Focal Length (35mm Equivalent)
27.0 mm ~ 52.5 mm
24.0 mm ~ 127.5 mm
Focus Type
Internal
Internal
Extending front
Image Stabilization
No
No
No
Weather Resistance
Yes
Zoom Type
Internal zoom
External zoom
Performance
Max Magnification
0.18x
0.23x
0.26x
Min Focus Distance
400 mm / 15.75 in
280 mm / 11.02 in
350 mm / 13.78 in
Production
Accessory
Lens Hood: LH780-03 (supplied)
Lens Hood: PR-RBA72 (supplied)
Debut
2014-01-06
2013-04-18
2014-10-29
Made In
Japan
Japan
Reviews
Neofiliac score
74%
65%
50%
Pros
- Exceptional sharpness
- Solid build quality
- Bright maximum aperture
- Internal zoom
- High levels of resolution
- Weather-sealed
Cons
- On the heavy side
- Rather large and heavy for an APS-C lens
- Not the best image quality
- Not the best build from Pentax
- External zoom without zoom lock
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