Motion blur on subject

I made some photos at a drifting race. First one was approved today. I want to share my technique. First of all, you will need a shutter speed of about 1/8 - 1/20 sec. This is beyond my anti-shake abilities with a 450 mm lens so I use a tripod. Also, I pre-focused on the road - see photo below. But this is not all. Because it was a sunny day and my camera can do only 1/4000, I used a neutral density filter ND8 which gave me minus 3 full stops so with a f11 or f9.5 I was able to lower my shutter speed at 1/10. The result was a very sharp background and a motion blurred car (two cars in this photo). Hope more photos will be approved, I have one at 1/6 and the car is so distorted - a ghost on the street! Wish you luck! Oh, btw, in this case I saw the limitation of my low speed cards - see the previous blog. Dorian King out.