Regardless, I did get some images that were usable from the races. The highest ISO (1600) my camera can go to is also a bit noisy, most noticeable in the shadows when viewed at maximum size. That ISO isn't as high as some of the newer DSLR's can achieve but does yield satisfactory handheld images. The ISO limits speeds to under 1/100 second which yields blurred images of the fast moving cars...not a bad thing when you are trying to convey their speed on the track.
More pics in my flickr set.