That long throw requires a special lens. (JW paid 1500. for his) We were lucky our projector came from another auditorium as it came with the lens. Otherwise, you have to mount it somewhere in the middle of the auditorium or in back of the screen, projected from the rear. I think the long throw is necessary unless you use some type of elevator thing to get the video proj. away from the film projector.
You can hang video in the middle like that but it's tricky to find the right place that doesn't interfere with the film projection and still looks okay. Better to get the long lens.
Mine is mounted outside the booth wall, just above the viewing port. Video source is inside the booth, and sound is hooked through the Dolby processor. My kid had his birthday party there with Halo and they had a great time!
I'm hearing that the best deals come from rental houses that are upgrading. And I'm looking for another one for the other aud.
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