Ok j ai trouvé ca pour Kenko, ca fait un paquet de choses à desactiver pour un fonctionnement optimum!

Please, turn off the following functions and modes in your camera: aberration correction function, focus aid assistance mode.
2. Due to activated Vibration Stabilization function in camera settings Kenko TELEPLUS DGX may not work properly. To avoid
problems with VR, turn this mode OFF.
3. AF function may not work properly if the integral aperture of the lens used with Kenko TELEPLUS DGX is more than F5.6.
4. The accuracy of AF at F8 is not guaranteed. Manual focus is recommended.
5. All other camera models that is not listed is not compatible with Kenko TELEPLUS DGX.
6. STM lenses cannot be used with older models than EOS 7D, 60D, 50D, 40D, 30D, 20D, 10D, D60, D30, Kiss X6.


Je pense que le 100 -400 de chez canon ,si je peux le coupler avec un multi 2x ,serait l'ideal pour moi 20cm pour 1.4kg c'est le top.