• Doubles the focal length of a Canon EF lenses (2.0x Magnification Factor) (Will not fit all EFs lenses due to long rear element length)

• Communication between lens & camera enables auto focus, auto iris & image stabilization

• A maximum aperture of f/4 or greater is required in order to fully utilize the autofocus capabilities.

• AF will only work properly if there is enough light and contrast on the subject to activate the camera's AF sensors. Manual focusing is recommended when using lenses with a smaller f-stop value.

• 5-Year Manufacturer Warranty