Comparison of Canon Extender EF 2x II and Olympus EC-20 2X Zuiko Digital

Attribute	Canon Extender EF 2x II ×	Olympus EC-20 2X Zuiko Digital ×
Notes	-	Can be attached to any ZUIKO DIGITAL interchangeable lens. Dust & Drip Proof. Included Accessories: Lens Cap (BC-1), Lens Case (LSC-0814).
Weight (g)	265	225
Type	Teleconverter	Teleconverter
Brand	Canon	Olympus
Name	Canon Extender EF 2x II	Olympus EC-20 2X Zuiko Digital
Lens Construction	7 elements in 5 groups	7 elements in 5 groups
Image Circle	35mm	Four-thirds
Magnification Ratio (x)	2	2
Diameter (mm)	71.8	68
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