Greetings All: I've been asked to photograph spray Planes (Crop dusters) as they make sray runs in a field. I'm thinking they will be coming right at me at about 120 MPH @ 4 ft. off the ground. The plan is to load the planes with water instread of chemical and for me to shoot until they raise up to get over me. What would the best focus setting for this type of shooting? I'm assuming I would use continuous but would Dynamic AF closest subject be the way to go? I plan on using a 17 - 35 lens and shoot @ 8-FPM. I'm leaving to do this later today so some (quick) ideas would be good. finally yes I know this is not something that most photo people would get involved in and the pilots have promised to miss me by (at least) 2 ft. Hope someone can help!