Comparison of Sigma 28-300mm f/3.5-6.3 DG Macro and Tamron AF 18-250mm f/3.5-6.3 Di II LD Aspherical IF Macro

Attribute	Sigma 28-300mm f/3.5-6.3 DG Macro ×	Tamron AF 18-250mm f/3.5-6.3 Di II LD Aspherical IF Macro ×
Filter Size (mm)	62	62
Notes	Available AF Mounts: Sigma, Canon, Nikon, Minolta, Pentax	Available AF Mounts: Canon, Nikon, Pentax, Sony; Included Accessories: Lens Hood
Closest Focus (m)	0.5	0.45
Magnification Ratio (x)	0.33	0.29
Type	Standard Zoom	Standard Zoom
Length (mm)	88	84.3
APS Equivalent	1.5x: 42 - 450mm; 1.6x: 44.8 - 480mm	1.5x: 27 - 375mm; 1.6x: 28.8 - 400mm
Zoom System	Rotary with lock	Rotary
Image Circle	35mm	APS-C
Focal Length (mm)	28.00 - 300.00	18.00 - 250.00
Brand	Sigma	Tamron
Name	Sigma 28-300mm f/3.5-6.3 DG Macro	Tamron AF 18-250mm f/3.5-6.3 Di II LD Aspherical IF Macro
Weight (g)	490	430
Aperture (f)	3.50 - 22.00	3.50 - 22.00
Diaphragm Blades	8	7
Diagonal Angle of View (degree)	8.20 - 75.40	6.40 - 75.60
Lens Construction	15 elements in 13 groups, including 4 aspherical and 2 SLD elements	16 elements in 13 groups, including 1 LD (Low Dispersion), 1 AD (Anomalous Dispersion) and 2 aspherical elements
Diameter (mm)	74	74.4
Focus Details	Internal	Internal