Comparison of Canon Extender EF 2x III and Nikon AF-S TC-20E II 2X

Attribute	Nikon AF-S TC-20E II 2X ×	Canon Extender EF 2x III ×
Notes	Compatible with AF-S and AF-I Nikkor lenses except AF-S 17-35mm f/2.8D IF-ED and AF-S 28-70mm f/2.8D IF-ED.	-
Weight (g)	355	325
Type	Teleconverter	Teleconverter
Brand	Nikon	Canon
Name	Nikon AF-S TC-20E II 2X	Canon Extender EF 2x III
Lens Construction	7 elements in 6 groups	9 elements in 5 groups
Image Circle	35mm	35mm
Magnification Ratio (x)	2	2
Diameter (mm)	66	72
Focal Length Multiplier	2X that of the master lens	2X that of the master lens
Effective Reduction in Aperture	2 f-stops	2 f-stops
Length (mm)	55	52.7