Comparison of Sigma APO 2X EX DG and Sony SEL20TC 2X

Attribute	Sigma APO 2X EX DG ×	Sony SEL20TC 2X ×
Type	Teleconverter	Teleconverter
Name	Sigma APO 2X EX DG	Sony SEL20TC 2X
Weight (g)	234	207
Image Circle	35mm	35mm
Brand	Sigma	Sony
Magnification Ratio (x)	2	2
Lens Construction	6 elements in 5 groups	8 elements in 5 groups, including 1 aspherical element
Notes	Available AF Mounts: Canon, Minolta, Nikon, Pentax, Sigma, Sony	For Sony E-mount; Compatible Lenses: Sony SEL70200GM and SEL100400GM lenses.
Diameter (mm)	68.5	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)	52	42.7