Comparison of Canon Extender EF 1.4x II and Canon Extender EF 1.4x III

Attribute	Canon Extender EF 1.4x II ×	Canon Extender EF 1.4x III ×
Weight (g)	220	225
Type	Teleconverter	Teleconverter
Brand	Canon	Canon
Name	Canon Extender EF 1.4x II	Canon Extender EF 1.4x III
Lens Construction	5 elements in 4 groups	7 elements in 3 groups
Image Circle	35mm	35mm
Magnification Ratio (x)	1.4	1.4
Diameter (mm)	72.8	72
Focal Length Multiplier	1.4X that of the master lens	1.4X that of the master lens
Effective Reduction in Aperture	1 f-stop	1 f-stop
Length (mm)	27.2	27.2