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

Attribute	Canon Extender EF 2x II ×	Panasonic DMW-STC2 2X ×
Notes	-	Splash, Dust, and Freezeproof design; Compatible with select L-Mount lenses
Weight (g)	265	230
Type	Teleconverter	Teleconverter
Brand	Canon	Panasonic
Name	Canon Extender EF 2x II	Panasonic DMW-STC2 2X
Lens Construction	7 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)	71.8	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)	57.9	41.6