Sigma APO Teleconverter 2x EX DG for Canon EF

The Sigma APO Teleconverter 2x EX DG is a teleconverter designed for use between compatible Sigma EX and Canon EF mount lenses and Canon EOS camera bodies, increasing the effective focal length of the attached lens by a factor of 2x while reducing the maximum aperture by two stops. The APO designation indicates the use of apochromatic optical elements within the teleconverter to help control chromatic aberration and maintain color accuracy and contrast when used with compatible lenses. The EX designation reflects Sigma’s higher tier of optical and mechanical construction, and the DG designation confirms optimization for use with digital sensor bodies alongside film SLR compatibility. Electronic contacts on both the lens and camera-facing mounts maintain full communication between the lens and body for autofocus, image stabilization, and EXIF data transmission with compatible lens and body combinations, though autofocus performance may be reduced depending on the maximum aperture of the combined lens and teleconverter configuration.

– 2x focal length multiplication factor
– Two-stop reduction in maximum aperture
– APO apochromatic elements for chromatic aberration control
– Sigma EX series optical and mechanical standards
– DG designation for digital sensor optimization
– Full electronic communication for autofocus and image stabilization
– Maintains EXIF data transmission
– Compatible with select Sigma EX and Canon EF mount lenses
– Autofocus performance may vary by lens and aperture combination
– Canon EF mount compatibility