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The Canon EF 2x II Extender is an easy and very affordable way to dramatically extend the reach (focal length) of compatible Canon L Series lenses (and a few additional lenses).
The Canon EF 2x II Extender mounts between the compatible lens and body, and multiplies the focal length settings of your lens by 2. The 2x decreases/narrows your lens' aperture setting by 2 stops.
For example, the Canon 2x makes a Canon EF 70-200mm f/2.8 L IS Lens into a 140-400mm f/5.6 IS lens - and IS still functions normally. A Canon EF 70-200mm f/4.0 L Lens mounted over a 2x becomes a 140-400mm f/8 lens. A Canon EF 300mm f/2.8 L IS Lens becomes a 600mm f/5.6 IS lens.
Extenders do not affect the MFD (Minimum Focus Distance) of the lens they are mounted behind, thus the MM (Maximum Magnification) of the lens is also multiplied by 2x.
Keep in mind that many non-pro Canon camera bodies need a minimum wide open aperture setting of f/5.6 for autofocus to work. Canon 1-Series camera bodies generally require f/8 for autofocus to work (the Canon EOS 1D X also requires f/5.6).
I'm not saying that you cannot USE apertures narrower than f/5.6 or f/8.0 while using the Canon 2x, but the lens + extender (with its 2 stop aperture loss) must be able to open up to at least these apertures for autofocus to work. The lens and extender combo can always be used in manual focus mode. A narrow maximum wide aperture creates a dark viewfinder that makes manual focusing even harder. Some people are reporting that some of the pins on the extender can be covered with tape to trick the camera into autofocusing.
The Canon EF 2x II Extender is relatively small and light. It is weather-sealed when used with similarly-sealed lenses and camera bodies. Build quality is excellent - Canon L Lens quality.
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