Thanks for all the positive feedback guys. I got to admit that these are the best 2 out of about 2000. Not a big keeper rate.
I started shooting at about 1/1000 sec to freeze the action but later in the day I was down to 1/250 sec due to the light dropping off and it was still freezing the action. But I was shooting in the slow corners. What sort of shutter speeds do you guys normally use for motor sport? Even at iso 400, I was only getting f5.6 at these slow shutter speeds.
Being so close to the corners at f4.5-f5.6, I was getting a very shallow dof with the 200 and 400 mm lenses. Some shots I got had the front of kart in but back of kart out of focus. Drifter, to soften that background on the first shot I'd have to do it in PP.
Sheepie, the D200 was focussing fine. Not too sure why you asked, maybe because some of the shots are a bit on the soft side.

With both the 80-200 and 80-400 being a bit slow to focus, I was using AF-ON for pre focusing on a point on the track and then waiting til the kart got to the right spot. I found that on 5fps only 1 or 2 shots were sharp in a sequence of 5 or 6, even with the karts in the slow corners. Next time I go, I'll still use AF-ON to pre focus, but use single shot
mode to select my shot rather than uzi
mode and hope.
I found that only about 20% of the drivers had clear visors. These were the ones I was concentrating on as I was really going for the eye shots. But some of the reflections in the other shots were interesting, showing the apex of the corner etc.
Ozczecho, in that 2nd shot I was using the 80-400 at 400mm and I was about 10m from the corner down a bank. That gave the impression I was lying on the ground. I definately wouldn't lie on the ground with those karts coming at me, just in case I needed to get away fast.
One other thing, this was my first time using a monopod and I found it very useful. Certainly stopped the camera and lens waving around and absolutely essential if you are going to pre focus. The monopod was borrowed, thanks O1, so more lust coming I'm afraid.
Cheers
John