Comparison of Nikon AF-S TC-20E III 2X and Tamron 2X TC-X20

Attribute	Tamron 2X TC-X20 ×	Nikon AF-S TC-20E III 2X ×
Type	Teleconverter	Teleconverter
Name	Tamron 2X TC-X20	Nikon AF-S TC-20E III 2X
Weight (g)	360	330
Image Circle	35mm	35mm
Brand	Tamron	Nikon
Magnification Ratio (x)	2	2
Lens Construction	9 elements in 5 groups, including 1 Low Dispersion element	7 elements in 5 groups (with 1 aspherical element)
Notes	Available AF Mounts: Canon EF, Nikon F; Included Accessories: Mount cap, Rear cap, Lens case	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)	53.6	46