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'IMAX inventors? (was Re: Moving message display)'
1997\02\11@190532 by Steve Hardy

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> From: John Dammeyer <spam_OUTjohndTakeThisOuTspamISLANDNET.COM>
>
> At 11:39 AM 11/02/1997 EST, you wrote:
> [cut]
> >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!

Regards,
SJH
Canberra, Australia

1997\02\11@215553 by Martin McCormick

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       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.

Martin McCormick

1997\02\12@025739 by John Dammeyer

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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:

http://www.moviegoers.com/IMAX/facts.html

John
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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