Sigma 18-50mm F2.8 EX DC Macro Canon on Canon EOS 50D vs Tamron SP 17-50mm F/2.8 Di II XR VC LD Aspherical IF Canon on Canon EOS 50D

COMPARISON SELECTION (3 selected items max.)

Sigma 18-50mm F2.8 EX DC Macro Canon

Sigma 18-50mm F2.8 EX DC Macro Canon

DXOMARK Score
Best at f=18mm & f/2.8 [?]	12

Lens Metric Scores
Sharpness [?]	6 P-Mpix
Transmission [?]	3.3 TStop
Distortion [?]	0.2 %
Vignetting [?]	-1 EV
Chr. aberration [?]	9 µm

Tamron SP 17-50mm F/2.8 Di II XR VC LD Aspherical IF Canon

Tamron SP 17-50mm F/2.8 Di II XR VC LD Aspherical IF Canon

DXOMARK Score
Best at f=17mm & f/2.8 [?]	12

Lens Metric Scores
Sharpness [?]	7 P-Mpix
Transmission [?]	3.4 TStop
Distortion [?]	0.3 %
Vignetting [?]	-0.7 EV
Chr. aberration [?]	6 µm

Sigma 18-50mm F2.8 EX DC Macro Canon

Sigma 18-50mm F2.8 EX DC Macro Canon

Announced	01/09/2006
Indicative price (USD)	419
Aperture	f/ 2.8
Focal range (mm)	18-50
Filter diameter (mm)	72
Max diameter (mm)	79
Mount type	Canon EF-S
Stabilization	No
AF Motor	Classic Motor
Zoom type	Ring
Rotating front element	No
Tripod mount	No
Color	Black
Full-Time manual focus	No
Number of lenses	15
Number of groups	13
Diaphragm blades	7
Circular aperture	No
Length (mm)	85.8
Weight (gr)	450

Certain fields may be left blank. They will be updated as soon as possible.

Tamron SP 17-50mm F/2.8 Di II XR VC LD Aspherical IF Canon

Tamron SP 17-50mm F/2.8 Di II XR VC LD Aspherical IF Canon

Announced	01/09/2009
Indicative price (USD)	649
Aperture	f/ 2.8
Focal range (mm)	17-50
Filter diameter (mm)	72
Max diameter (mm)	72
Mount type	Canon EF-S
Stabilization	VC
AF Motor	DC
Zoom type	Ring
Rotating front element	No
Tripod mount	No
Color	Black
Full-Time manual focus	No
Number of lenses	19
Number of groups	14
Diaphragm blades	7
Circular aperture	No
Length (mm)	94.5
Weight (gr)	570

Certain fields may be left blank. They will be updated as soon as possible.