Compare SIGMA 18-50mm F2.8 DC DN vs Tamron 28-200mm F/2.8-5.6 vs Tamron 17-70mm F/2.8
Construction
Aperture Blades
7 blades, Rounded blades
7 blades
9 blades
Colors
Black
Black
Black
Form Factor
Standard Zoom Lens
All-in-One Zoom Lens
Standard Zoom Lens
Image Size
APS-C
Full-Frame
APS-C
Lens Mount
Leica L-mount, Sony E-mount
Sony E-mount
Sony E-mount
Motor
Stepper motor
Stepper motor
Stepper motor
Optical Formula | Elements
13 elements
18 elements
16 elements
Optical Formula | Groups
10 groups
14 groups
12 groups
Optical Formula | Special Glass
1 Super Low Dispersion and 3 aspherical elements groups
Aspherical, hybrid aspherical, extra-low dispersion, low-dispersion elements + BBAR coating groups
1 aspherical + 2 glass-molded aspherical elements groups
Dimensions
Filter Diameter
55 mm / 2.17 in
67 mm / 2.64 in
67 mm / 2.64 in
Size | Diameter
65 mm / 2.56 in
74 mm / 2.91 in
75 mm / 2.95 in
Size | Length
75 mm / 2.95 in
117 mm / 4.61 in
119 mm / 4.69 in
Weight
290 g / 10.25 oz
576 g / 20.35 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)
75.4° Diagonal | 65.5° Horizontal | 46.4° Vertical (wide) ~ 12.4° Diagonal | 10.3° Horizontal | 6.9° 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/2.8–5.6 ~ f/16–32
f/2.8 ~ f/22
Autofocus
Yes
Yes
Yes
Crop Factor
1.5
1.5
Focal Length
18 mm ~ 50 mm
28 mm ~ 200 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 (zoom lock available)
External zoom
Performance
Max Magnification
0.32x
0.21x
Min Focus Distance
120 mm / 4.72 in
190 mm / 7.48 in
190 mm / 7.48 in
Production
Accessory
Lens Hood: LH582-02 (supplied)
Lens hood included
Lens hood included
Debut
2021-10-19
2020-06-11
2020-12-03
Made In
Japan
Model Name
A071
B070
Reviews
Neofiliac score
55%
60%
69%
Pros
- Constant f/2.8 aperture
- Very sharp wide open
- Dust and splash protection
- Fast AF
- Very useful focal range
- Zoom lock prevents zoom creep
- Weather-sealed
- Optically stabilized
- Weather-sealed
- Fast AF
- Good image quality
Cons
- External zoom without zoom lock
- Not stabilized
- All-in-one lenses tend to offer lower IQ
- Not the sharpest
- External zoom without zoom lock
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