Comparison of Sigma 28-200mm f/3.5-5.6 Aspherical IF Macro and Tamron AF 28-200mm f/3.8-5.6 XR Aspherical IF Macro

Attribute	Sigma 28-200mm f/3.5-5.6 Aspherical IF Macro ×	Tamron AF 28-200mm f/3.8-5.6 XR Aspherical IF Macro ×
Filter Size (mm)	62	62
Notes	Available AF Mounts: Sigma, Canon, Nikon, Minolta, Pentax; Include Accessories: Lens Hood	Available AF Mounts: Canon, Minolta, Nikon, Pentax; Included Accessories: Lens Hood
Closest Focus (m)	0.48	0.49
Magnification Ratio (x)	0.26	0.25
Type	Standard Zoom	Standard Zoom
Length (mm)	77.7	75.2
APS Equivalent	1.5x: 42 - 300mm; 1.6x: 44.8 - 320mm	1.5x: 42 - 300mm; 1.6x: 44.8 - 320mm
Zoom System	Rotary with lock	Rotary
Image Circle	35mm	35mm
Focal Length (mm)	28.00 - 200.00	28.00 - 200.00
Brand	Sigma	Tamron
Name	Sigma 28-200mm f/3.5-5.6 Aspherical IF Macro	Tamron AF 28-200mm f/3.8-5.6 XR Aspherical IF Macro
Weight (g)	380	354
Aperture (f)	3.50 - 22.00	3.80 - 22.00
Diaphragm Blades	8	7
Diagonal Angle of View (degree)	12.30 - 75.40	12.00 - 75.00
Lens Construction	16 elements in 14 groups, including 2 aspherical elements	14 elements in 10 groups, including aspherical and XR elements
Diameter (mm)	70	71
Focus Details	Internal	Internal