The perfect telephoto zoom lens for bird photography? Canon RF 100-500 f/4.5-7.1 L IS USM Review

I had the opportunity to test the Canon RF 100-500mm f/4.5-7.1 L IS USM lens for about two month. I took it to Southern Europe (Spain) and up to 83° North (Russian Arctic). I used the lens on both the Canon EOS R5 and Canon EOS R and took pictures of birds, polar bears and landscapes. In this video I want to share with you my experiences regarding the image quality (sharpness), autofocus, image stabilizer and general handling. I also used it with a 1.4x extender. Thanks to Canon Switzerland for sending me this lens for reviewing. If you liked this video, please consider subscribing to my channel :-)