Compare SIGMA 18-50mm F2.8 DC DN vs Tamron 17-70mm F/2.8
Construction
Aperture Blades
7 blades, Rounded blades
9 blades
Colors
Black
Black
Form Factor
Standard Zoom Lens
Standard Zoom Lens
Image Size
APS-C
APS-C
Lens Mount
Leica L-mount, Sony E-mount
Sony E-mount
Motor
Stepper motor
Stepper motor
Optical Formula | Elements
13 elements
16 elements
Optical Formula | Groups
10 groups
12 groups
Optical Formula | Special Glass
1 Super Low Dispersion and 3 aspherical elements groups
1 aspherical + 2 glass-molded aspherical elements groups
Dimensions
Filter Diameter
55 mm / 2.17 in
67 mm / 2.64 in
Size | Diameter
65 mm / 2.56 in
75 mm / 2.95 in
Size | Length
75 mm / 2.95 in
119 mm / 4.69 in
Weight
290 g / 10.25 oz
525 g / 18.55 oz
Function
Angle Of View
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
Autofocus
Yes
Yes
Crop Factor
1.5
1.5
Focal Length
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
Image Stabilization
No
Yes
Weather Resistance
Yes
Yes
Zoom Type
External zoom
External zoom
Performance
Max Magnification
0.21x
Min Focus Distance
120 mm / 4.72 in
190 mm / 7.48 in
Production
Accessory
Lens Hood: LH582-02 (supplied)
Lens hood included
Debut
2021-10-19
2020-12-03
Made In
Japan
Model Name
B070
Reviews
Neofiliac score
55%
69%
Pros
- 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
- Not stabilized
- External zoom without zoom lock
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