Comparison of Canon Extender EF 1.4x III and Tamron 1.4X TC-X14

Attribute	Canon Extender EF 1.4x III ×	Tamron 1.4X TC-X14 ×
Notes	-	Available AF Mounts: Canon EF, Nikon F; Included Accessories: Mount cap, Rear cap, Lens case
Weight (g)	225	205
Type	Teleconverter	Teleconverter
Brand	Canon	Tamron
Name	Canon Extender EF 1.4x III	Tamron 1.4X TC-X14
Lens Construction	7 elements in 3 groups	6 elements in 3 groups
Image Circle	35mm	35mm
Magnification Ratio (x)	1.4	1.4
Diameter (mm)	72	70
Focal Length Multiplier	1.4X that of the master lens	1.4X that of the master lens
Effective Reduction in Aperture	1 f-stop	1 f-stop
Length (mm)	27.2	21.4