Comparison of Tamron F AF 1.4X and Tamron 1.4X TC-X14

Attribute	Tamron 1.4X TC-X14 ×	Tamron F AF 1.4X ×
Type	Teleconverter	Teleconverter
Name	Tamron 1.4X TC-X14	Tamron F AF 1.4X
Weight (g)	205	170
Image Circle	35mm	35mm
Brand	Tamron	Tamron
Magnification Ratio (x)	1.4	1.4
Lens Construction	6 elements in 3 groups	4 elements in 4 groups
Notes	Available AF Mounts: Canon EF, Nikon F; Included Accessories: Mount cap, Rear cap, Lens case	Available AF Mounts: Canon, Minolta, Nikon, Pentax
Diameter (mm)	70	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)	21.4	18.8