P3D Re: NTSC interlaced images

[Marvin Jones <Campfire@xxxxxxxxxxxxxx>]

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>You are correct in that one eye is not exactly a whole frame behind the 
other. In fact I set up an experiment with a video camera and a turntable 
on which I had placed a paper disc with spokes printed at intervals which 
represent 1/30 sec of rotation. I had expected to demonstrate that at a 
certain degree of opaqueness or darkness of the filter that the delay 
would be 1/30 of a sec. It wasn't. The delay is apparently much shorter 
than that.<

In NTSC video, the picture is actually replaced 60 time per second (each
picture being written on only half the lines). This, of course, is the
basis of Alternate Field video. However, even in "normal" video, the two
fields are different, sequential images. So it's possible for the delay to
be as little as 1/60 of a second and the two eyes to "see" different
images.


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