Comparison of Sigma TC-1401 1.4X Teleconverter and Tamron 1.4X TC-X14

Attribute	Tamron 1.4X TC-X14 ×	Sigma TC-1401 1.4X Teleconverter ×
Type	Teleconverter	Teleconverter
Name	Tamron 1.4X TC-X14	Sigma TC-1401 1.4X Teleconverter
Weight (g)	205	190
Image Circle	35mm	35mm
Brand	Tamron	Sigma
Magnification Ratio (x)	1.4	1.4
Lens Construction	6 elements in 3 groups	7 elements in 5 groups, including 1 SLD element
Notes	Available AF Mounts: Canon EF, Nikon F; Included Accessories: Mount cap, Rear cap, Lens case	Dust and splash-proof; Available AF Mounts: Canon EF, Nikon F, Sigma SA
Diameter (mm)	70	69.8
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)	21.4	25