Comparison of Sigma 28-200mm f/3.5-5.6 Aspherical IF Macro and Tamron AF 18-250mm f/3.5-6.3 Di II LD Aspherical IF Macro

Attribute	Tamron AF 18-250mm f/3.5-6.3 Di II LD Aspherical IF Macro ×	Sigma 28-200mm f/3.5-5.6 Aspherical IF Macro ×
Filter Size (mm)	62	62
Notes	Available AF Mounts: Canon, Nikon, Pentax, Sony; Included Accessories: Lens Hood	Available AF Mounts: Sigma, Canon, Nikon, Minolta, Pentax; Include Accessories: Lens Hood
Closest Focus (m)	0.45	0.48
Magnification Ratio (x)	0.29	0.26
Type	Standard Zoom	Standard Zoom
Length (mm)	84.3	77.7
APS Equivalent	1.5x: 27 - 375mm; 1.6x: 28.8 - 400mm	1.5x: 42 - 300mm; 1.6x: 44.8 - 320mm
Zoom System	Rotary	Rotary with lock
Image Circle	APS-C	35mm
Focal Length (mm)	18.00 - 250.00	28.00 - 200.00
Brand	Tamron	Sigma
Name	Tamron AF 18-250mm f/3.5-6.3 Di II LD Aspherical IF Macro	Sigma 28-200mm f/3.5-5.6 Aspherical IF Macro
Weight (g)	430	380
Aperture (f)	3.50 - 22.00	3.50 - 22.00
Diaphragm Blades	7	8
Diagonal Angle of View (degree)	6.40 - 75.60	12.30 - 75.40
Lens Construction	16 elements in 13 groups, including 1 LD (Low Dispersion), 1 AD (Anomalous Dispersion) and 2 aspherical elements	16 elements in 14 groups, including 2 aspherical elements
Diameter (mm)	74.4	70
Focus Details	Internal	Internal