Comparison of Sigma 18-300mm f/3.5-6.3 DC Macro OS HSM Contemporary and Tamron AF 18-270mm f/3.5-6.3 Di II VC LD Aspherical IF Macro

Attribute	Sigma 18-300mm f/3.5-6.3 DC Macro OS HSM Contemporary ×	Tamron AF 18-270mm f/3.5-6.3 Di II VC LD Aspherical IF Macro ×
Aperture (f)	3.50 - 22.00	3.50 - 22.00
Filter Size (mm)	72	72
Notes	Image Stabilization; Available OS AF mounts: Canon EF, Nikon F, Sigma SA; Non-OS AF mounts: Sony A, Pentax K	Image Stabilization. Available AF Mounts: Canon, Nikon. Included Accessories: Lens Hood.
Closest Focus (m)	0.38	0.49
Magnification Ratio (x)	0.33	0.29
Zoom System	Rotary	Rotary
Type	Standard Zoom	Standard Zoom
APS Equivalent	1.5x: 27 - 450mm; 1.6x: 28.8 - 480mm	1.5x: 27 - 405mm; 1.6x: 28.8 - 432mm
Diaphragm Blades	7	7
Image Circle	Image Circle	APS-C
Focal Length (mm)	18.00 - 300.00	18.00 - 270.00
Brand	Sigma	Tamron
Name	Sigma 18-300mm f/3.5-6.3 DC Macro OS HSM Contemporary	Tamron AF 18-270mm f/3.5-6.3 Di II VC LD Aspherical IF Macro
Weight (g)	585	560
Diaphragm Blades Type	rounded	rounded
Lens Construction	17 elements in 13 groups, including 1 SLD and 4 FLD elements; Super Multi-Layer Coating	18 elements in 13 groups, including 2 LD (Low Dispersion) and 3 aspherical elements
Diagonal Angle of View (degree)	5.40 - 76.50	6.00 - 75.60
Length (mm)	101.5	101
Diameter (mm)	79	79.6
Focus Details	Internal HSM (Hyper Sonic Motor) with AF/MF switch	Internal