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'IMAX inventors? (was Re: Moving message display)'
> From: John Dammeyer <ISLANDNET.COM> johnd
> At 11:39 AM 11/02/1997 EST, you wrote:
> >only 24Hz. Apart from that, it's a wonderful (Aussie) invention.
> I beg to differ. Canadians invented and pateneted [sic] the IMAX system.
Well, IMAX was an international effort. An Aussie came up with the
'rolling loop' film transport mechanism (which is what I had in mind,
since it is the key to the whole concept - such large film would not
stand up to the old jerky geneva mechanism). But, as you say, the
enthusiastic Canadians developed this into a system (along with German
optics, and sundry parts from all over the globe). Only Hollywood
didn't have anything to do with it!
How does the Imax film transport work? I used to repair lots of
16-MM projectors in the eighties and I am fimilar with the geneva mechanism
you describe, at least the way it is on sixteen-s.
Unless I am totally mixed up, the Imax film is 35-MM film but the
frames are shot length-wise so the whole system would look like a conventional
projector lying on its side. I also seem to recall that the sound is digital
and recorded between the sproket holes.
|At 08:54 PM 11/02/1997 -0600, you wrote:
> How does the Imax film transport work? I used to repair lots of
>16-MM projectors in the eighties and I am fimilar with the geneva mechanism
>you describe, at least the way it is on sixteen-s.
> Unless I am totally mixed up, the Imax film is 35-MM film but the
>frames are shot length-wise so the whole system would look like a conventional
>projector lying on its side. I also seem to recall that the sound is digital
>and recorded between the sproket holes.
70 mm and yes, lying on its side. But as for number of frames per second I
think it's still quite slow. I noticed a lot of the flicker as the camera
panned when I was able to visit the IMAX in Edmonton. Now I live on
Vancouver Island so no IMAX. sob!
And... by the way, I can be humble (and wrong). Yes the rolling loop
principal was invented by an Australian but developed in 1967 by Canadians.
<sigh> Nothing else to do down under I guess. <grin>
Check it out here:
Pioneers are the ones, face down in the mud,
with arrows in their backs.
Automation Artisans Inc. Ph. 1-250-544-4950
PO Box 20002 Fax 1-250-544-4954
Sidney, BC CANADA V8L 5C9
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