Comparison of Nikon AF-S TC-17E II 1.7X and Panasonic DMW-STC2 2X

Attribute	Nikon AF-S TC-17E II 1.7X ×	Panasonic DMW-STC2 2X ×
Type	Teleconverter	Teleconverter
Name	Nikon AF-S TC-17E II 1.7X	Panasonic DMW-STC2 2X
Weight (g)	250	230
Image Circle	35mm	35mm (L-Mount)
Brand	Nikon	Panasonic
Magnification Ratio (x)	1.7	2
Lens Construction	7 elements in 4 groups	8 elements in 4 groups, including 2 UHR (Ultra High Refractive Index) elements
Notes	Designed exclusively for use with Nikkor AF-S and AF-I lenses.	Splash, Dust, and Freezeproof design; Compatible with select L-Mount lenses
Diameter (mm)	66	65.3
Focal Length Multiplier	1.7X that of the master lens	2X that of the master lens
Effective Reduction in Aperture	1.5 f-stop	2 f-stops
Length (mm)	31.5	41.6