<p>Thanks for all the feedback from everyone. The race cars I shoot do not stop when working on pan shots. They are moving from right to left or vs versa depending on what part of the track I am standing at. Sometimes the cars do move slightly towards or away from the camera while moving L to R , or R to L . I enjoy making pan shots at 1/60th of a second in order to blur the background and alow the wheels to blur. the challenge is to hold the image steady in the view finder while panning. I have found it almost impossible to get a sharp in forcus image at 1/30 of a sec or slower.<br>
My question was intended to provoke responces on the best auto fucus set up on my Nikon D70 which it did and I am thankful for. I alos realize that depth of field is important in order to get the largest part of the car in focus. I need to reshearch for my digital camera as I have years of experience while film but am a relative newby for digital.</p>