Comparison of Canon Extender EF 2x III and Sigma TC-2001 2X Teleconverter

Attribute	Canon Extender EF 2x III ×	Sigma TC-2001 2X Teleconverter ×
Notes	-	Dust and splash-proof; Available AF Mounts: Canon EF, Nikon F, Sigma SA
Weight (g)	325	290
Type	Teleconverter	Teleconverter
Brand	Canon	Sigma
Name	Canon Extender EF 2x III	Sigma TC-2001 2X Teleconverter
Lens Construction	9 elements in 5 groups	10 elements in 5 groups, including 2 SLD elements
Image Circle	35mm	35mm
Magnification Ratio (x)	2	2
Diameter (mm)	72	69.8
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)	52.7	48.9