AF at center AF point, when any Version I, II or III Canon tele extender is used with compatible EF tele lenses; AF at 27 focus points, and the central 9 points acting as cross-type points, with the following lens + extender combinations: EF 100–400mm f/4.5–5.6L IS II lens, with Extender EF 1.4x III Benefits. Extends the master lens focal length by 2x. Compatible with L-Series telephoto and telephoto zoom lenses. Optimised lens coatings. Improved communication between lens and camera. Highly resistant to dust and water. Outstanding image quality. Benefits. Extends the master lens focal length by 2x. Outstanding image quality. Highly resistant to dust and water. Improved communication between lens and camera. Optimised lens coatings. Compatible with L-Series telephoto and telephoto zoom lenses. If you used a 1.4x extender then the 100-400 f/4-5.6 becomes a 140-560mm f/5.6-8 lens and that WILL work becuase the wide-open apertures are f/8 or lower for every focal length available. The 2x extender must not be used with any with a focal ratio higher than f/4.
This appears to be a direct knockoff of the Canon 2.0x III Extender which costs 2.5x as much. I tested this against the Kenko 2x Pro 300 teleconverter (which is one of the best) and by comparison this has better corner sharpness and much reduced chromatic aberrations.
The Extender EF 2x III is specially designed to work in conjunction with L-series IS super-telephoto lenses, extending their focal length by a factor of 2x. The extender's design ensures there is no loss of lens performance or image quality. Compatibility. This extender is only compatible with fixed focal length L-series lenses 135mm and over
Lens Extender compatibility with EOS 5D Mark IV and EF 70-200 f/2.8L IS II USM lens in EOS DSLR & Mirrorless Cameras 12-19-2023; Extender EF 1.4x III compatible with EF mount? in Camera Accessories 12-18-2023; EOS Rebel T6 Extender and Lens Recommendations in EF & RF Lenses 12-10-2023 Uj7X.
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    • canon extender ef 2x iii compatibility