Comparison of Pentax 1.4X-L and Sigma TC-1401 1.4X Teleconverter

Attribute	Sigma TC-1401 1.4X Teleconverter ×	Pentax 1.4X-L ×
Type	Teleconverter	Teleconverter
Name	Sigma TC-1401 1.4X Teleconverter	Pentax 1.4X-L
Weight (g)	190	175
Image Circle	35mm	35mm
Brand	Sigma	Pentax
Magnification Ratio (x)	1.4	1.4
Lens Construction	7 elements in 5 groups, including 1 SLD element	5 elements in 5 groups
Notes	Dust and splash-proof; Available AF Mounts: Canon EF, Nikon F, Sigma SA	Usable Lenses: SMC Pentax A-, F-, M-lenses
Diameter (mm)	69.8	65.5
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	28.5