Viltrox C- 2XII TELEPLUS can make the focal length increased to 2 times,and the auto- function of the lens can be used perfectly, and don't change the EXIF information. C- 2XII specially use for 100mm or more fixed focal length lens, but not recommend for use in less than 60mm of short- lens.

Features:
Replacement for Canon EF-Mount 100mm and above Lens. (Perfect for 200 ~ 500mm lens, lens under 60mm is not recommended.)
Can increase the lens length to 2 times.
Support lens' function (Auto ) and won't affect to Exif information.
Adopt 7 optical glasses, 4 groups, the depth of field is half of the lens.
helper for long distance photography.
With upgraded USB firmware interface.

Specifications:
Brand: Viltrox
Model: C- 2XII
Mount Type: For Canon EF-Mount Lens
Magnification: 2X
Depth of Field: Half of the Lens
Min Stacking Focal Length: Equal to the Lens
Constitution of the Lens: 7 Glasses, 4 Group
Mode: Full Auto
Lens Coating: Multi-coated
Exposure Factor: Appro. 4 Times (Equal to 2 aperture)
Item Size: 6.7 * 6.7 * 6.7cm / 2.6 * 2.6 * 2.6in(With front & rear cover)
Item Weight: 159.5g / 5.6oz
Package Size: 9.4 * 9.4 * 9.1cm / 3.7 * 3.7 * 3.6in
Package Weight: 210.5g / 7.4oz

Package List: D2624GY
1 * Teleconverter Lens with Front & Rear
1 * User Manual(English/Chinese)

Note:
and lens are not included.