[miro]

"You must learn to see your frustrations in a positive light" 

Thanks Dave, I do that immediately .  :-)
The 4k video of previous generation Eos Rs  worked fine but at 1/3 of sensor surface /1.7x crop/
The next generation EOS Rs R5/R6 work excellent at 1/5 of max speed.

PS: I consider to buy buy R6. I fully understand that R5 & R6 are not pro camera. I also realize that all Japanise cameras offer too little but ask to much, but it is my hobby.