Comparison of Canon Extender EF 1.4x III and Nikon AF-S TC-17E II 1.7X

Attribute	Nikon AF-S TC-17E II 1.7X ×	Canon Extender EF 1.4x III ×
Notes	Designed exclusively for use with Nikkor AF-S and AF-I lenses.	-
Weight (g)	250	225
Type	Teleconverter	Teleconverter
Brand	Nikon	Canon
Name	Nikon AF-S TC-17E II 1.7X	Canon Extender EF 1.4x III
Lens Construction	7 elements in 4 groups	7 elements in 3 groups
Image Circle	35mm	35mm
Magnification Ratio (x)	1.7	1.4
Diameter (mm)	66	72
Focal Length Multiplier	1.7X that of the master lens	1.4X that of the master lens
Effective Reduction in Aperture	1.5 f-stop	1 f-stop
Length (mm)	31.5	27.2