As pointed out in this post, we have a projector similar to this:
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http://originaltrilogy.com/forum/topic.cfm/team-negative1-star-wars-1977-35mm-theatrical-version-release-details-and-updates/post/715948/#TopicPost715948
We are using something like a professional Red Video camera (Not this one):
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The video is captured directly from the projector, not off any surface.
Also, the sound is captured directly through the Dolby Digital decoder. (Again, not our machine, but similar to this)
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Team Negative1