Hi everyone, I have managed to get my hands on a decent quality Canon 300mm f2.8 IS lens. Im fairly certain that somebody in the past said that when shooting sports its better to turn the IS off as it would reduce the speed of the auto focus. I would be using a monopod and have it mounted mostly to an R7 or sometimes an R6 (which i think both have built in IS). Can someone with more experience than me please offer some advice? Thanks