Comparison of Sigma 18-250mm f/3.5-6.3 DC Macro OS HSM and Tamron AF 18-250mm f/3.5-6.3 Di II LD Aspherical IF Macro

Attribute	Sigma 18-250mm f/3.5-6.3 DC Macro OS HSM ×	Tamron AF 18-250mm f/3.5-6.3 Di II LD Aspherical IF Macro ×
Notes	Image Stabilization; Available AF mounts: Sigma, Sony, Nikon, Canon and Pentax.	Available AF Mounts: Canon, Nikon, Pentax, Sony; Included Accessories: Lens Hood
Magnification Ratio (x)	0.34	0.29
Filter Size (mm)	62	62
Length (mm)	88.6	84.3
Closest Focus (m)	0.35	0.45
Diagonal Angle of View (degree)	5.70 - 69.30	6.40 - 75.60
Focus Details	Internal HSM (Hyper Sonic Motor) with AF/MF switch	Internal
Focal Length (mm)	18.00 - 250.00	18.00 - 250.00
APS Equivalent	1.5x: 27 - 375mm; 1.6x: 28.8 - 400mm	1.5x: 27 - 375mm; 1.6x: 28.8 - 400mm
Brand	Sigma	Tamron
Image Circle	Image Circle	APS-C
Name	Sigma 18-250mm f/3.5-6.3 DC Macro OS HSM	Tamron AF 18-250mm f/3.5-6.3 Di II LD Aspherical IF Macro
Weight (g)	470	430
Type	Standard Zoom	Standard Zoom
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 1 Special Low Dispersion (SLD) and 3 aspherical elements	16 elements in 13 groups, including 1 LD (Low Dispersion), 1 AD (Anomalous Dispersion) and 2 aspherical elements
Zoom System	Rotary	Rotary
Diameter (mm)	73.5	74.4