Canon 300mm f2.8 L IS + Canon 2x extender III sharpness debunked!!

I am showing large resolution files to prove that Canon 300mm f2.8 L IS mark1 and Canon extender 2x mark3 at wide open aperture show some amazing results. You can support me on my Patreon page:   / tomasrak   Music in the video is used from Youtube free music audio library section and it is called - Getz Me to Brazil - Doug Maxwell