motorsport action Audi at speed...

Taken at Sonoma's Infineon Raceway of the 200+ MPH Audi LM900.

impressive considering the speed of the car

This is just too blurry. Panning takes a lot of practice, and you have to take the good with the bad. Just keep shooting!!

Too blurry (camera shake, too slow a shutter speed) and not in focus, I'm afraid.

 

The best way to tackle this sort of shot is to watch the cars go through, see what line they take. Then manually prefocus on that line, using a spot on the track as a marker so you know when to press the shutter. Pick the car up well before that point and follow it through smoothly till after you've taken the photo; rotate your body from the waist and squeeze the shutter as the car passes the marker.

 

Ideally you want to be using a shutter speed in the range of 1/125 to 1/180 so that you'll get the car sharp, but blur the wheels and the background in a pleasing manner.

 

Hope this helps :)