Comparison of Nikon AF-S TC-20E III 2X and Sigma TC-2001 2X Teleconverter

Attribute	Sigma TC-2001 2X Teleconverter ×	Nikon AF-S TC-20E III 2X ×
Type	Teleconverter	Teleconverter
Name	Sigma TC-2001 2X Teleconverter	Nikon AF-S TC-20E III 2X
Weight (g)	290	330
Image Circle	35mm	35mm
Brand	Sigma	Nikon
Magnification Ratio (x)	2	2
Lens Construction	10 elements in 5 groups, including 2 SLD elements	7 elements in 5 groups (with 1 aspherical element)
Notes	Dust and splash-proof; Available AF Mounts: Canon EF, Nikon F, Sigma SA	Designed for use with AF-S and AF-I Nikkor lenses. See Description tab for compatibility.
Diameter (mm)	69.8	66
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)	48.9	46