Comparison of Canon Extender EF 2x III and Panasonic DMW-STC2 2X

Attribute	Canon Extender EF 2x III ×	Panasonic DMW-STC2 2X ×
Notes	-	Splash, Dust, and Freezeproof design; Compatible with select L-Mount lenses
Weight (g)	325	230
Type	Teleconverter	Teleconverter
Brand	Canon	Panasonic
Name	Canon Extender EF 2x III	Panasonic DMW-STC2 2X
Lens Construction	9 elements in 5 groups	8 elements in 4 groups, including 2 UHR (Ultra High Refractive Index) elements
Image Circle	35mm	35mm (L-Mount)
Magnification Ratio (x)	2	2
Diameter (mm)	72	65.3
Focal Length Multiplier	2X that of the master lens	2X that of the master lens
Effective Reduction in Aperture	2 f-stops	2 f-stops
Length (mm)	52.7	41.6