Features:
Viltrox C-AF 2X TELEPLUS can make the focal length of all the for Canon EF lens increased to 2 times as respectively,and the auto-focus function of the original camera lens can be used perfectly, and don't change the EXIF information.
C-AF 2X specially use for 100mm or more fixed focal length lens, but not recommend for use in less than 60mm of short-focus lens.

Specification:
Mount Type: for Canon EF-Mount lens 
Magnification: 2 times
Depth of field: Half of the original lens Constitution of the lens: 7 glasses,4 groups
Focus mode: full auto focus
Lens coating: Multi-coated
Exposure factor: Approx 4 times
Item size: 6.7 * 5cm / 2.6 * 2.0in(D*H)
Item weight: 131g / 4.64oz
Package size: 9.5 * 9.5 * 9.5cm / 3.7 * 3.7 * 3.7in
Package weight: 202g / 7.17oz

Package List:
1 * Teleconverter
2 * Covers
1 * User Manual(Chinese&English)