Sigma 17-50mm F2.8 EX DC OS HSM vs. Tamron SP AF 17-50mm F/2.8 XR Di II LD Aspherical (IF) vs. Tokina AF-X Pro 16-50mm f/2.8 DX

Side by side
3 lenses compared
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Feb 20, 2010
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-
 
Zoom lens
Zoom lens
Zoom lens
APS-C / DX
APS-C / DX
APS-C / DX
17–50 mm
17–50 mm
16–50 mm
Yes (4 stops claimed)
No
No
Canon EF-S, Nikon F (DX), Pentax KAF3, Sigma SA Bayonet, Sony/Minolta Alpha DT
Canon EF-S, Nikon F (DX), Pentax KAF, Sony/Minolta Alpha
Canon EF-S, Nikon F (DX)
 
F2.8
F2.8
F2.8
F22
F32
F22
No
No
No
7
7
9
Rounded diaphragm
circular aperture
 
 
17
16
15
13
13
12
2 FLD glass elements 2 glass mold elements 1 hybrid aspherical lens
2 hybrid aspherical elements 1 LD (Low Dispersion) glass element 1 XR (Extra Refractive) element
SD element
 
0.28 m (11.02)
0.27 m (10.63)
0.30 m (11.81)
0.2×
0.22×
 
Yes
Yes
Yes
Ultrasonic
Micromotor
Screw drive from camera
No
Unknown
Yes
Internal
Internal
Internal
For Pentax mount, AF will not function with DSLR cameras that do not support HSM
 
Canon version includes AF micromotor
Yes
Yes
Yes
No
Yes
Yes
No
 
 
 
565 g (1.25 lb)
430 g (0.95 lb)
610 g (1.34 lb)
84 mm (3.29)
74 mm (2.91)
84 mm (3.31)
92 mm (3.62)
82 mm (3.22)
97 mm (3.83)
Metal mount
 
 
No
 
Yes
 
Black
Black
Rotary (extending)
Rotary (extending)
Rotary (extending)
 
Yes
 
77 mm
67 mm
77 mm
Does not rotate on focusing
 
 
Yes
Yes
Yes
 
flower shaped hood
BH-777
No
No
No