Comparison of Canon Extender EF 1.4x III and Panasonic DMW-STC14 1.4X

Attribute	Canon Extender EF 1.4x III ×	Panasonic DMW-STC14 1.4X ×
Notes	-	Splash, Dust, and Freezeproof design; Compatible with select L-Mount lenses
Weight (g)	225	180
Type	Teleconverter	Teleconverter
Brand	Canon	Panasonic
Name	Canon Extender EF 1.4x III	Panasonic DMW-STC14 1.4X
Lens Construction	7 elements in 3 groups	7 elements in 4 groups, including 2 UHR (Ultra High Refractive Index) elements
Image Circle	35mm	35mm (L-Mount)
Magnification Ratio (x)	1.4	1.4
Diameter (mm)	72	65.3
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	27.6