Viltrox C-AF 2XII TELEPLUS can make the focal length of all the for Canon EF lens increased to 2 times,and the auto-focus function of the original camera lens can be used perfectly, and don't change the EXIF information.

Compatibility:
C-AF 2XII is only compatible with fixed focal length L-series lenses 135mm and over, as well as the EF 70-200mm f/2.8L, EF 70-200mm f/2.8L IS, EF 70-200mm f/4L, and EF 100-400mm f/4.5-5.6L.

Mount type:Canon EF-Mount lens
Magnification:2 times
Depth of Field:Half of the original lens
Min stacking focal length:Equal to the original lens 
Constitution of the lens:7 glasses, 4 group
Focus mode:Auto focus
Lens Coating:Multi-coated
Exposure factor:Approx. 4 times (equal to 2 aperture ) 
Diameter and length:Approx. 68×51mm
Weight: Approx 154g

• Compatible for Canon EF Mount Lens(not for Canon EF-S lens). 
• Can increase the original lens focus length to 2 times. 
• Support lens Auto Focus function and won't affect to Exif information. 
• Adopt 7 optical glasses, 4 groups, the depth of field is half of the original lens. 
• Good helper for long distance photography. 
• With upgraded USB firmware interface. 
   

• 1 x Viltrox C-AF 2X II TELEPLUS Adapter
• 1 x Product Manual