Compare SIGMA 28-70mm F2.8 DG DN vs SIGMA 18-50mm F2.8 DC DN vs Tamron 17-70mm F/2.8
Construction
Aperture Blades
9 blades
7 blades, Rounded blades
9 blades
Colors
Black
Black
Black
Form Factor
Standard Zoom Lens
Standard Zoom Lens
Standard Zoom Lens
Image Size
Full-Frame
APS-C
APS-C
Lens Mount
Leica L-mount, Sony E-mount
Leica L-mount, Sony E-mount
Sony E-mount
Material
Magnesium alloy
Motor
Stepper motor
Stepper motor
Stepper motor
Optical Formula | Elements
16 elements
13 elements
16 elements
Optical Formula | Groups
12 groups
10 groups
12 groups
Optical Formula | Special Glass
2 FLD + 2 SLD + 3 aspherical elements, Nano Porous + Super Multi-Layer coating groups
1 Super Low Dispersion and 3 aspherical elements groups
1 aspherical + 2 glass-molded aspherical elements groups
Dimensions
Filter Diameter
67 mm / 2.64 in
55 mm / 2.17 in
67 mm / 2.64 in
Size | Diameter
72 mm / 2.83 in
65 mm / 2.56 in
75 mm / 2.95 in
Size | Length
102 mm / 4.02 in
75 mm / 2.95 in
119 mm / 4.69 in
Weight
470 g / 16.61 oz
290 g / 10.25 oz
525 g / 18.55 oz
Function
Angle Of View
75.4° Diagonal | 65.5° Horizontal | 46.4° Vertical (wide) ~ 34.4° Diagonal | 28.8° Horizontal | 19.5° Vertical (tele)
77.4° Diagonal | 67.4° Horizontal | 47.9° Vertical (wide) ~ 32.2° Diagonal | 27.0° Horizontal | 18.2° Vertical (tele)
80.7° Diagonal | 70.4° Horizontal | 50.4° Vertical (wide) ~ 23.3° Diagonal | 19.5° Horizontal | 13.0° Vertical (tele)
Aperture
f/2.8 ~ f/22
f/2.8 ~ f/22
f/2.8 ~ f/22
Autofocus
Yes
Yes
Yes
Crop Factor
1.5
1.5
Focal Length
28 mm ~ 70 mm
18 mm ~ 50 mm
17 mm ~ 70 mm
Focal Length (35mm Equivalent)
27.0 mm ~ 75.0 mm
25.5 mm ~ 105.0 mm
Focus Type
Internal
Internal
Internal
Image Stabilization
No
No
Yes
Weather Resistance
Yes
Yes
Yes
Zoom Type
External zoom
External zoom
External zoom
Performance
Max Magnification
0.3x
0.21x
Min Focus Distance
190 mm / 7.48 in
120 mm / 4.72 in
190 mm / 7.48 in
Production
Accessory
Lens hood included
Lens Hood: LH582-02 (supplied)
Lens hood included
Debut
2021-02-24
2021-10-19
2020-12-03
Made In
Japan
Japan
Model Name
B070
Reviews
Neofiliac score
74%
55%
69%
Pros
- Weather-sealed
- Lightweight and compact
- Good image quality
- Fast autofocus
- Constant f/2.8 aperture
- Very sharp wide open
- Dust and splash protection
- Optically stabilized
- Weather-sealed
- Fast AF
- Good image quality
Cons
- External zoom without zoom lock
- Vignetting at 70mm
- External zoom without zoom lock
- Not stabilized
- External zoom without zoom lock
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