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Author Topic: Porthole for projection booth Rick Raskin Phenomenal Film Handler Posts: 1100 From: Manassas Virginia Registered: Jan 2003 posted 07-28-2013 03:47 PM                     I take it from the film can in pictured your latest post you are running 16mm. Unless your projector sounds like a rock crusher a single pane glass should suffice. Angle it towards the floor to redirect reflections and you are good to go. Anything else is overkill.  |  IP: Logged Gary A. Hoselton Film Handler Posts: 59 From: Portland OR U.S.A. Registered: Nov 2005 posted 07-31-2013 05:44 PM                     I agree, I've built my screening room with single pane of the 25mm (~1/4") thick coated glass from Germany via Los Angeles, angled down so reflection from screen will be absorbed by seatbacks. This puts booth-side reflection up on back wall which I painted flat medium gray, and that trivial reflection is absorbed in booth ceiling. Determine port glass tilt angle by constructing elevation view along center line of room, showing projector lens and screen at actual heights and any inclination of screen from vertical. Then draw light reflection lines from top and bottom of image on screen back thru port glass to lens, and determine tilt of port glass so bottom screen reflection off of glass returns to below screen. In my room, tilt is about 5 degrees, but that depends on your screen height and throw. Do not tilt glass up to put screen reflection on ceiling, as your audience will be looking up at image on ceiling rather than at screen and you will feel dumb.  |  IP: Logged Steve Guttag We forgot the crackers Gromit!!! Posts: 12814 From: Annapolis, MD Registered: Dec 1999 posted 08-01-2013 06:41 AM                     25mm = 1/4-inch? Ummmmm....no. 25mm is nealy a full inch! 6mm is typically the 1/4" equivalent in glass.  |  IP: Logged

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