Comparison of Sigma 18-200mm f/3.5-6.3 DC and Tamron AF 18-200mm f/3.5-6.3 XR Di II LD Aspherical IF

Attribute	Tamron AF 18-200mm f/3.5-6.3 XR Di II LD Aspherical IF ×	Sigma 18-200mm f/3.5-6.3 DC ×
Aperture (f)	3.50 - 22.00	3.50 - 22.00
Filter Size (mm)	62	62
Notes	Available mounts: Canon, Minolta, Nikon, Pentax. Includes petal type hood.	Available AF Mounts: Sigma, Canon, Nikon, Nikon (HSM), Minolta/Sony, Pentax, Four-Thirds
Closest Focus (m)	0.45	0.45
Magnification Ratio (x)	0.27	0.23
Diameter (mm)	73.8	70
Type	Standard Zoom	Standard Zoom
APS Equivalent	1.5x: 27 - 300mm; 1.6x: 28.8 - 320mm	1.5x: 27 - 300mm; 1.6x: 28.8 - 320mm
Diaphragm Blades	7	7
Image Circle	Image Circle	Image Circle
Focal Length (mm)	18.00 - 200.00	18.00 - 200.00
Brand	Tamron	Sigma
Name	Tamron AF 18-200mm f/3.5-6.3 XR Di II LD Aspherical IF	Sigma 18-200mm f/3.5-6.3 DC
Weight (g)	398	405
Diagonal Angle of View (degree)	7.00 - 75.00	7.10 - 69.30
Lens Construction	15 elements in 13 groups, with low dispersion, aspherical and extra reffractive index elements	15 elements in 13 groups, including two aspherical elements and two Special Low Dispersion (SLD) lenses
Zoom System	Rotating, Telescoping	Rotary
Length (mm)	83.7	78.1
Front Element Rotation	-	-
Focus Details	Internal focusing system	Internal, fixed lens length during focusing