Comparison of Panasonic DMW-STC2 2X and Sigma APO 2X EX DG

Attribute	Sigma APO 2X EX DG ×	Panasonic DMW-STC2 2X ×
Type	Teleconverter	Teleconverter
Name	Sigma APO 2X EX DG	Panasonic DMW-STC2 2X
Weight (g)	234	230
Image Circle	35mm	35mm (L-Mount)
Brand	Sigma	Panasonic
Magnification Ratio (x)	2	2
Lens Construction	6 elements in 5 groups	8 elements in 4 groups, including 2 UHR (Ultra High Refractive Index) elements
Notes	Available AF Mounts: Canon, Minolta, Nikon, Pentax, Sigma, Sony	Splash, Dust, and Freezeproof design; Compatible with select L-Mount lenses
Diameter (mm)	68.5	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)	52	41.6