Comparison of Canon Extender EF 2x II and Sony SEL20TC 2X

Attribute	Canon Extender EF 2x II ×	Sony SEL20TC 2X ×
Notes	-	For Sony E-mount; Compatible Lenses: Sony SEL70200GM and SEL100400GM lenses.
Weight (g)	265	207
Type	Teleconverter	Teleconverter
Brand	Canon	Sony
Name	Canon Extender EF 2x II	Sony SEL20TC 2X
Lens Construction	7 elements in 5 groups	8 elements in 5 groups, including 1 aspherical element
Image Circle	35mm	35mm
Magnification Ratio (x)	2	2
Diameter (mm)	71.8	62.4
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)	57.9	42.7