Yes, if you shoot off a tri or mono pod, you're better off turning off the IS. Some Canon bodies incorporate IS in the body... mostly you'll find the IS on the lens. I believe that Nikon does the same (but again, I'm a Canon shooter so I don't know for fact).

I've shot sports with IS mode 1 on. I felt like I was fighting the IS when I panned to track the action. There were some jumps and bumps during that battle.

These are some B-roll shots (the A roll belongs to the service I shot for).
[Linked Image from i.imgur.com]
[Linked Image from i.imgur.com]

Last edited by ChrisF; 03/29/21.