Viltrox C-AF 2X Teleplus Teleconverter Extender for DSLR Canon EF Lens

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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