Comparison of Olympus EC-20 2X Zuiko Digital and Sigma APO 2X EX DG

Attribute	Sigma APO 2X EX DG ×	Olympus EC-20 2X Zuiko Digital ×
Type	Teleconverter	Teleconverter
Name	Sigma APO 2X EX DG	Olympus EC-20 2X Zuiko Digital
Weight (g)	234	225
Image Circle	35mm	Four-thirds
Brand	Sigma	Olympus
Magnification Ratio (x)	2	2
Lens Construction	6 elements in 5 groups	7 elements in 5 groups
Notes	Available AF Mounts: Canon, Minolta, Nikon, Pentax, Sigma, Sony	Can be attached to any ZUIKO DIGITAL interchangeable lens. Dust & Drip Proof. Included Accessories: Lens Cap (BC-1), Lens Case (LSC-0814).
Diameter (mm)	68.5	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)	52	41