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Author Topic: glass and angle Anhtu Vu Film Handler Posts: 98 From: Montreal, Quebec, Canada Registered: Jun 2013 posted 10-02-2015 08:24 AM                     I need to change the glass for my projection window. Any recommendations ? Ideally in the montreal area. And how about the ideal angle ? thx  |  IP: Logged Rick Raskin Phenomenal Film Handler Posts: 1100 From: Manassas Virginia Registered: Jan 2003 posted 10-02-2015 10:50 AM                     Tilt it so it puts reflections onto the floor.  |  IP: Logged Sam D. Chavez Film God Posts: 2153 From: Martinez, CA USA Registered: Aug 2003 posted 10-02-2015 01:29 PM                       Floor of audience or booth? Can't be too careful with someone who posts multiple times on the same question.  |  IP: Logged Rick Raskin Phenomenal Film Handler Posts: 1100 From: Manassas Virginia Registered: Jan 2003 posted 10-02-2015 04:00 PM                     Good point.  |  IP: Logged Mark Gulbrandsen Resident Trollmaster Posts: 16657 From: Music City Registered: Jun 99 posted 10-02-2015 05:04 PM                     There IS actually a spec for this as far as maximum and minimum tilt is involved. I was involved with some Goldberg ports way back when and they did track down a recommended spec for it. Not sure if it was SMPTE or Kodak or who the heck wrote the spec, but one does exist. Mark  |  IP: Logged Anhtu Vu Film Handler Posts: 98 From: Montreal, Quebec, Canada Registered: Jun 2013 posted 10-02-2015 09:15 PM                     So strange as i've gotten so many different suggestions/recommendations from professionals on this topics. I'm setting up a mix room for a friend with a Barco 4K, we tried both tilted and non tilted glass….no difference. The non tilted arrangement did not produce any ghosting… Mark…do you know where i can find this SMPTE document ?  |  IP: Logged Marco Giustini Film God Posts: 2713 From: Reading, UK Registered: Nov 2007 posted 10-03-2015 06:04 AM                     if it's a single glass, it should not produce ghosting. If you have a double glass, parallel sheets WILL produce awful ghosting. It's always nice to tilt it a little anyway, to avoid possible reflections from the lens or the 3D device, if any.  |  IP: Logged Paul Mayer Oh get out of it Melvin, before it pulls you under! Posts: 3836 From: Albuquerque, NM Registered: Feb 2000 posted 10-03-2015 04:07 PM                        I don't remember the exact number, but it's called the Brewster Angle. Laser guys know about it. Do a Google search on things like Brewster Angles and the US Bureau of Radiological Health laser standards...  |  IP: Logged

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