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

Attribute	Sigma 18-200mm f/3.5-6.3 DC Macro OS HSM Contemporary ×	Tamron AF 18-200mm f/3.5-6.3 XR Di II LD Aspherical IF ×
Filter Size (mm)	62	62
Notes	Image Stabilization; Available OS AF mounts: Canon EF, Nikon F, Sigma SA; Non-OS AF mounts: Sony A, Pentax K	Available mounts: Canon, Minolta, Nikon, Pentax. Includes petal type hood.
Closest Focus (m)	0.39	0.45
Magnification Ratio (x)	0.3	0.27
Diameter (mm)	70.7	73.8
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
Diagonal Angle of View (degree)	8.10 - 76.50	7.00 - 75.00
Image Circle	Image Circle	Image Circle
Focal Length (mm)	18.00 - 200.00	18.00 - 200.00
Brand	Sigma	Tamron
Name	Sigma 18-200mm f/3.5-6.3 DC Macro OS HSM Contemporary	Tamron AF 18-200mm f/3.5-6.3 XR Di II LD Aspherical IF
Weight (g)	430	398
Aperture (f)	3.50 - 22.00	3.50 - 22.00
Diaphragm Blades	7	7
Diaphragm Blades Type	rounded	-
Lens Construction	16 elements in 13 groups, including SLD and aspherical elements	15 elements in 13 groups, with low dispersion, aspherical and extra reffractive index elements
Zoom System	Rotary	Rotating, Telescoping
Length (mm)	86	83.7
Front Element Rotation	-	-
Focus Details	Internal HSM (Hyper Sonic Motor) with AF/MF switch	Internal focusing system