Comparison of Canon EF 300mm f/4L IS USM and Tamron 70-200mm f/2.8 Di LD IF Macro SP AF

Attribute	Canon EF 300mm f/4L IS USM ×	Tamron 70-200mm f/2.8 Di LD IF Macro SP AF ×
Filter Size (mm)	77	77
Notes	Image Stabilization	Available mounts: Canon, Nikon, Pentax, Sony; Included accessories: Petal-shaped lens hood
Closest Focus (m)	1.5	0.95
Magnification Ratio (x)	0.24	0.32
Type	Telephoto Prime	Telephoto Zoom
Focus Details	Inner focusing; full-time manual focus and USM	Internal Focusing; One-touch AF/MF Switchover mechanism (for Canon and Nikon only)
APS Equivalent	480mm	1.5x: 105 - 300mm; 1.6x: 112 - 320mm
Diameter (mm)	90	89.5
Image Circle	35mm	35mm
Focal Length (mm)	300.00	70.00 - 200.00
Brand	Canon	Tamron
Name	Canon EF 300mm f/4L IS USM	Tamron 70-200mm f/2.8 Di LD IF Macro SP AF
Weight (g)	1190	1100
Aperture (f)	4.00 - 32.00	2.80 - 32.00
Diaphragm Blades	8	9
Diagonal Angle of View (degree)	8.30	12.30 - 34.30
Length (mm)	221	194.3
Zoom System	-	Rotary
Lens Construction	15 elements in 11 groups, including 2 UD elements	18 elements in 13 groups, including 3 LD (low dispersion) elements