>
> I don't know about 1/30th for racecars ...
It's impressive as all get-out if you can manage it.
I've never got quite that slow, but I have shot several at 1/60,
and even one reasonable shot at 1/45. One of the regulars from
a few years ago used to consistently do shots at 1/20 or slower.
A quick back-of-the-envelope calculation: on a high-speed track
the cars will be running at 200mph or faster - over 300 feet/sec.
That means that during a 1/30 exposure the car will travel 10 ft;
around half its own length.
It's easier to practice with slower-moving vehicles. These are
a couple of shots from AMA superbikes at slower-speed parts of
my local track - I doubt if either is moving as fast as 100mph.
I'd guess I was shooting at 1/180 or 1/250 for these shots.
http://www.panix.com/~johnf/temp/ama-ls-99-1.jpg
http://www.panix.com/~johnf/temp/ama-ls-99-2.jpg
