Review on 📸 Enhance Your Canon EF Mount Lens with Kenko TELEPLUS HD pro 1.4X DGX Teleconverter by Troy Gerhardt

It works very well with my R for IQ but doesn't recognize the lens opening properly. Used on Canon R with EF 70-200 f4 L IS, it reports F4 with lens on F4, same story on my EF 70-300 L. It reports correct FL. I would return it but nobody else makes a decent 1.4 that works on an EF 70-300 L. Focus is good at R at f8 with an EF 70-300L, makes a nice 100-420mm F5.6-8 lens for outside air. It would be ideal if it reported the F-stop correctly on my EOS R: (I have an IQ test of 70-300 at 300 with no 1.4x and with 1.4x 1.4x vom Aim removed, couldn't tell the difference :) YES, I know they don't list R for a compatible body, but that's the only decent 1.4x I know of.