Compare Tamron 18-400mm F/3.5-6.3 vs Tamron 17–70mm F2.8
Construction
Aperture Blades
7 blades
9 blades, Circular diaphragm
Colors
Black
Black
Form Factor
All-in-One Zoom Lens
Standard Zoom Lens
Image Size
APS-C
APS-C
Lens Mount
Canon EF-mount, Nikon F-mount
Fujifilm X-mount, Sony E-mount
Motor
Ring-type ultrasonic
Stepper motor
Optical Formula | Elements
16 elements
16 elements
Optical Formula | Groups
11 groups
12 groups
Optical Formula | Special Glass
Low dispersion, aspherical, hybrid aspherical elements groups
Two GM (Glass Molded Aspherical) elements and one hybrid aspherical lens element. groups
Dimensions
Filter Diameter
72 mm / 2.83 in
67 mm / 2.64 in
Size | Diameter
79 mm / 3.11 in
75 mm / 2.95 in
Size | Length
124 mm / 4.88 in
120 mm / 4.72 in
Weight
710 g / 25.09 oz
530 g / 18.73 oz
Function
Angle Of View
77.4° Diagonal | 67.4° Horizontal | 47.9° Vertical (wide) ~ 4.1° Diagonal | 3.4° Horizontal | 2.3° Vertical (tele)
80.7° Diagonal | 70.4° Horizontal | 50.4° Vertical (wide) ~ 23.3° Diagonal | 19.5° Horizontal | 13.0° Vertical (tele)
Aperture
f/3.5–6.3 ~ f/22–40
f/2.8
Autofocus
Yes
Yes
Crop Factor
1.5
1.5
Focal Length
18 mm ~ 400 mm
17 mm ~ 70 mm
Focal Length (35mm Equivalent)
27.0 mm ~ 600.0 mm
25.5 mm ~ 105.0 mm
Focus Type
Extending front
Internal
Image Stabilization
Yes
Yes
Weather Resistance
Yes
Yes
Zoom Type
External zoom (zoom lock available)
External zoom
Performance
Max Magnification
0.34x
Min Focus Distance
450 mm / 17.72 in
200 mm / 7.87 in
Production
Accessory
Lens hood included
Lens hood included
Debut
2017-06-23
2022-06-16
Model Name
B028
Reviews
Neofiliac score
60%
59%
Pros
- Extreme zoom range
- Optically stabilized
- Zoom lock prevents zoom creep
- Weather-sealed
- Optically stabilized
- Weather-sealed
- Decent build quality
Cons
- All-in-one lenses tend to offer lower IQ
- Not the highest grade of image quality
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