Comparison of Sigma TC-1401 1.4X Teleconverter and Tamron F AF 1.4X

Attribute	Sigma TC-1401 1.4X Teleconverter ×	Tamron F AF 1.4X ×
Type	Teleconverter	Teleconverter
Name	Sigma TC-1401 1.4X Teleconverter	Tamron F AF 1.4X
Weight (g)	190	170
Image Circle	35mm	35mm
Brand	Sigma	Tamron
Magnification Ratio (x)	1.4	1.4
Lens Construction	7 elements in 5 groups, including 1 SLD element	4 elements in 4 groups
Notes	Dust and splash-proof; Available AF Mounts: Canon EF, Nikon F, Sigma SA	Available AF Mounts: Canon, Minolta, Nikon, Pentax
Diameter (mm)	69.8	66.5
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)	25	18.8