P3D IMAX at the Trocadero

[Project3D@xxxxxxx]

In a message dated 3/6/98 7:29:39 pm, Dave Spacey wrote:

<<Boris Starosta wrote, of Imax 3D:-

>I did not perceive any flicker at first, though later I saw a little
>"jumpiness" in bright objects moving rapidly across screen.  I didn't
>really know what to expect, but somehow did not expect such a good stereo
>image.

I'm glad some one else thought that.  When I saw 'Across The Sea Of Time'
last year I got exactly the same effect.  There are some fast pans in that
film, which looked *horrible*.  I'd assumed that the two views were shot
simultaneously, where the shutter glasses were showing us left-right-left.
Does anyone know if the straight polarised presentations are immune to
this problem?>>

I noticed it, too. I'm sure the Trocadero is using an interlaced (frame
sequential) method. Whatever the glasses system, the strobing effect will be
the same in this case. 

<<I did also see some ghosting however.  Maybe the batteries in my headset
were on their last legs.  I didn't complain though, not wanting to sound
too discouraging.>>

I, too, saw some ghosting. And the window violation was much more obvious when
I was sitting at the end of the back row when I saw the preview, than when I
saw in the middle of the back row (paying guest!). I guess that the screen
failed to completely fill my field of view when I sat at the edge. I noticed
on the second viewing that they positioned the audience in the centre (it
wasn't full, but there was a reasonable audience).

Bob Aldridge


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