Comparison of Canon Extender EF 2x II and Sigma APO 2X EX DG

Attribute	Canon Extender EF 2x II ×	Sigma APO 2X EX DG ×
Notes	-	Available AF Mounts: Canon, Minolta, Nikon, Pentax, Sigma, Sony
Weight (g)	265	234
Type	Teleconverter	Teleconverter
Brand	Canon	Sigma
Name	Canon Extender EF 2x II	Sigma APO 2X EX DG
Lens Construction	7 elements in 5 groups	6 elements in 5 groups
Image Circle	35mm	35mm
Magnification Ratio (x)	2	2
Diameter (mm)	71.8	68.5
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	52