I'm shooting macro video with a Sony a6300 with a 50mm macro lens. I'm trying to do food shots with extremely shallow depth of field, for example two cookies, one behind the other. I'm trying to do a 3 second video with the back cookie in focus, then quickly snap the front cookie into focus. The trouble is when I twist the focus ring it shakes the camera and the video comes out shaky.
I've put it on a tripod but it's not enough. Since the shot is so close-up, even the tiniest shake makes the video look bad. Any tips on how to stabilize the shot without buying expensive equipment?