Comparison of Panasonic DMW-STC2 2X and Tamron 2X TC-X20

Attribute	Tamron 2X TC-X20 ×	Panasonic DMW-STC2 2X ×
Type	Teleconverter	Teleconverter
Name	Tamron 2X TC-X20	Panasonic DMW-STC2 2X
Weight (g)	360	230
Image Circle	35mm	35mm (L-Mount)
Brand	Tamron	Panasonic
Magnification Ratio (x)	2	2
Lens Construction	9 elements in 5 groups, including 1 Low Dispersion element	8 elements in 4 groups, including 2 UHR (Ultra High Refractive Index) elements
Notes	Available AF Mounts: Canon EF, Nikon F; Included Accessories: Mount cap, Rear cap, Lens case	Splash, Dust, and Freezeproof design; Compatible with select L-Mount lenses
Diameter (mm)	69.8	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)	53.6	41.6