> I have spoken to commercial photographers who used these old units
> and considered it normal to be able to get an extremely sharp stop
> motion of a ballet dancer doing a twirl, and in the photo the outer edge
> of the skirt is absolutely crisp sharp in the photo

I've had a first go at measuring the flash lengths. The length of the bar
is 160mm (describes a 1m circumference circle), rotated at 2400rpm
-> 40rps -> 40,000mm/s

In the first there's little blurring. Flash time must be quite short as 1mm
blur would be 25us. I've enhanced the end portion. What I should have
done is have something more definable (a drawing perhaps) at the end
of the bar to test for blurring. The second shot is definitely blurred, even
without enhancement, possibly 50-100us flash. Although the more
powerful flash may be reflecting off the walls enough to blur the shot

The 22uF flash would probably be adequate with a wider aperture and
some shot processing. 47uF might be a fair compromise

http://home.clear.net.nz/pages/joecolquitt/speed_test1.jpg

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