> Assuming none of the cars stop and everyone flies through the intersection at > 30 mph, the image frame encompasses 1/2 block, what is the minimum shutter > speed needed to prevent the moving cars registering? Greg, you devil, Well, according to my postulated theory ... the fact it is 1/2 block does not make much difference ... what matters is the speed that cars are moving at. Assume a car is 15 feet long. At 30mph it is moving at about 45 feet per second. So it covers its own length in 1/3 second ... so 100 times that is 30 seconds. So, the answer is 30 seconds. am I right? andy
