Comparison of Nikon AF-S TC-17E II 1.7X and Olympus EC-20 2X Zuiko Digital

Attribute	Olympus EC-20 2X Zuiko Digital ×	Nikon AF-S TC-17E II 1.7X ×
Type	Teleconverter	Teleconverter
Name	Olympus EC-20 2X Zuiko Digital	Nikon AF-S TC-17E II 1.7X
Weight (g)	225	250
Image Circle	Four-thirds	35mm
Brand	Olympus	Nikon
Magnification Ratio (x)	2	1.7
Lens Construction	7 elements in 5 groups	7 elements in 4 groups
Notes	Can be attached to any ZUIKO DIGITAL interchangeable lens. Dust & Drip Proof. Included Accessories: Lens Cap (BC-1), Lens Case (LSC-0814).	Designed exclusively for use with Nikkor AF-S and AF-I lenses.
Diameter (mm)	68	66
Focal Length Multiplier	2X that of the master lens	1.7X that of the master lens
Effective Reduction in Aperture	2 f-stops	1.5 f-stop
Length (mm)	41	31.5