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The Canon EF 1.4x II Extender is a high-quality teleconverter that preserves the image quality of the lens it's mounted to and multiplies its focal length by 1.4x. When combined with pro level EOS cameras & EF supertelephoto lenses with image stabilization, near imperviousness to weather extremes is achieved thanks to rubber gasket seals. Improved anti-reflective internal coatings also increase transmissivity and performance in backlit conditions.
The extender will cut back the amount of light by one f/stop. For example using a 1.4x teleconverter with a 300mm f/2.8 lens will effectively increase the focal length to approximately 420mm and the f/2.8 aperture will now be f/4. Teleconverters are best used with longer telephoto lenses.
attempting to mount a Canon extender on incompatible lenses may damage the rear lens element. Canon extenders simply do not fit behind the rear lens element on Canon's non-extender-compatible lenses.
As a rule, but subject to change, the compatible lenses include fixed focal length L lenses 135mm and longer, zoom L lenses at least 70mm on their wide end and Canon TS-E Tilt-Shift lenses.
Auto-focus may or may not work depending on the lens but manual focus is always available.
- Autofocus is possible on any EOS camera when combined with a lens having an f/4 or faster maximum aperture.
- If the lens is attached to an EOS camera having multiple focusing points and an extender attached, only the center focusing point will be usable for AF.