With the 600 mounted on a tripod/gimbal I have both more and less control than doing things handheld. I spend the time to clean the camera, the TC and lenses, especially near the mating surfaces. Dust accumulates the fastest in one area but once it starts there, it is everywhere within a month. People have jokingly called it a NASCAR tire change when I swap, which has probably reduced the issue, but not eliminated it. Camera is off to reduce any dust attracting charge, camera angled down, etc. Most of my shots are in Southern California, a coastal desert/windy mountains/actual desert so dust is going to be in air. The part that is overlooked is I'm still usually tracking a subject and sudden movements aren't helping there which is why I'd prefer a selectable unit attached.