Comparison of Canon EF 70-300mm f/4-5.6 IS USM and Tamron 18-400mm f/3.5-6.3 Di II VC HLD (Model B028)

Attribute	Tamron 18-400mm f/3.5-6.3 Di II VC HLD (Model B028) ×	Canon EF 70-300mm f/4-5.6 IS USM ×
Filter Size (mm)	72	58
Notes	Image Stabilization (CIPA 2.5 stops); Available mounts: Canon and Nikon; Includes petal type lens hood; Compatible with TAP-in Console	Image Stabilization
Closest Focus (m)	0.45	1.5
Magnification Ratio (x)	0.34	0.26
Diaphragm Blades	7	-
Type	Standard Zoom	Telephoto Zoom
APS Equivalent	1.5x: 27 - 600mm; 1.6x: 28.8 - 640mm	112 - 480mm
Zoom System	Rotary (extending) with zoom lock switch	Rotary
Image Circle	Image Circle	35mm
Focal Length (mm)	18.00 - 400.00	70.00 - 300.00
Brand	Tamron	Canon
Name	Tamron 18-400mm f/3.5-6.3 Di II VC HLD (Model B028)	Canon EF 70-300mm f/4-5.6 IS USM
Weight (g)	710	630
Aperture (f)	3.50 - 40.00	4.00 - 32.00
Lens Construction	16 elements in 11 groups, including 3 LD (low dispersion) and 3 aspherical elements	15 elements in 10 groups
Diagonal Angle of View (degree)	4.00 - 75.55	8.00 - 34.00
Focus Details	Internal with HLD motor	Front-focusing method with helicoid ring drive
Diameter (mm)	79	76.5
Length (mm)	123.9	142.8
Diaphragm Blades Type	rounded	-
Front Element Rotation	-	-