Manufacturer's Description
The EF 2x II doubles the focal length of any lens it's mounted to, and reduces its effective aperture by two stops. Autofocusing does not operate if the effective maximum aperture is greater than f/5.6 (greater than f/8 on the EOS 1V and EOS 3).
Successors to the EF2x this model offers valuable improvements for further enhanced image quality.
This extender allows users to combine practicality and functionality with a new optical system allowing them to extend the master lens focal length by 2x, with minimal loss of lens performance or image quality.
Specially designed to work in conjunction with the EOS-1V and IS super telephoto L-series lenses, it makes a highly dust- and water-resistant combination.
The EF2x II features improved anti-reflection materials inside the lens-barrel as well as improved coating around the outer edges of the lenses to reduce flare. All of these improvements will allow professional photographers to capture higher quality images than ever before.Successors to the EF2x this model offers valuable improvements for further enhanced image quality.
Box Contents
Canon 2x Extender
Customer Reviews
Expensive alternative
The good thing about this teleconverter is that if fits like a globe and is easy to handle to gget in and out.
The problem is that ONLY works well with canon L series lenses and if you use anything less you will need to use MF , if you are lucky .The pictures will suffer from camera shake and they will come out dark ( unless one is fortunate witht the light ).
Is best to invest in a profer telephoto lens than to rely on teleconverters unless you are on a very long treck and you can't carry your biggest telephoto.
If you have to choose between the 1.4 and the 2* ,I would much prefer the 1.4.
Don't get me started with the price....
Last resort
I own this and the Canon 1.4x.
The 1.4x works very well with the Canon 500mm f4 but I only use the 2x as a last resort for that record shot.I cannot seem to achieve the sharpness I need for bird photos with the 2x
