At 2:46 PM -0700 8/13/01, Jim Couch wrote:
Yeah, but I want cold hard numbers! How much shorter, at what speeds (car and
shutter) is it noticible in, say, and 8x10 print. Is there a difference in how
noticible it is in either direction. :)
It's going to depend on a lot of stuff, but in 1/90 second (approximation
to the shutter time, which is always faster than 1/60 for margin) a car
going 60 mph will move about a foot. So if you were crazy enough to have
the car full-frame and moving directly across, your typical car 15 feet
long would be expanded or compressed by 70r so. (Meanwhile at 1/1000)
you would have a nominal inch of motion blur throughout.) On a racetrack
the distortion could be 200r so (but that would require pressing the
shutter at the right time within about 10 milliseconds, ignoring panning
issues and suchlike).
What could be weirder is a situation where something is moving toward or
awat from the camera, so that you'd have signficantly different apparent
sizes or vertical positions on opposing sides of the frame.
paul
--
Paul Wallich pw@xxxxxxxxx
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