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From: geoff@callan.UUCP (Geoff Kuenning)
Newsgroups: net.columbia
Subject: Re: IMAX/OMNIMAX camera
Message-ID: <128@callan.UUCP>
Date: Sat, 24-Mar-84 20:33:32 EST
Article-I.D.: callan.128
Posted: Sat Mar 24 20:33:32 1984
Date-Received: Tue, 27-Mar-84 00:30:50 EST
References: <2261@watcgl.UUCP>
Organization: Callan Data Systems, Westlake Village, CA
Lines: 17

Dave Martindale says:

>	To show a 1-hour film they would either have
>	to modify the supply and takeup reel transport, or have an intermission
>	while reels were changed.

Why can't they do it the way a regular movie theater does it?  A standard
reel of 35-mm film lasts about 20 minutes.  Each reel begins with a short
section that duplicates the end of the previous reel.  A simple method allows
the projectionist to start the second projector in sync with the end of the
first reel;  she then simply presses a button and voila! a shutter falls in
front of projector 1 and is raised from in front of projector 2.  At the
same time, sound tracks are also switched.

Is it the extremely high cost of the IMAX projectors that prevents this
method from being used?  Or must they be perfectly aligned with the screen,
so that it is impossible to have two side-by-side?