I tossed my rectangular hood too. It was just too big. I am using a flower style, and it is smaller. But it still seems to stick out a bit in front of those small auto-focus sensors to the left of the lens. I don't know for sure if it is screwing up the focus. I'm shooting some basic training videos, and shooting a still scene of a machine, and noticed with the hood on, it was blurring the right side of the frame more than the left, and in the past, same scene, I never had that issue.
I checked, and regular auto focus was on, and iAF, was not. Where in the past, iAF was on. So I switched it to iAF and didn't notice it.
Does anyone know how to keep some manual settings active all the time?
I had to brighten up the exposure a full 1.0, and after a few minutes, when the screen saver kicked in, it would go back to the default. I had to reset it back to 1.0 several times during the day.
Annoying more than anything I guess.