24 Jun
2013
24 Jun
'13
5:21 p.m.
On 6/24/2013 3:47 PM, Cordwell, William R wrote:
Speaking of wheels turning, in many old movies, the stagecoach wheels seem to be turning backwards--is that simply an effect of the film frequency and the wheel angular frequency?
Yeah, that's just frequency aliasing as the film frame rate and the wheel spoke rate cross over. You also see it in movies of aircraft propellors as the engines start up. Brent Meeker