VILTROX C-AF 2X II TELEPLUS Auto Focus 2.0X Telephoto Extender Teleconverter Lens Converter for Canon EF Mount Super Telephoto Lens 135mm f/2L,70-200mm,10L,70-200mm,100-400mm and DSLR Camer (C-AF2XII)

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.
Features: 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.
Specifications: 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
Package Listing: 1 x Viltrox C-AF 2X II TELEPLUS Adapter 1 x Product Manual