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TOPIC: Projector to Screen Angle

Projector to Screen Angle 20 Oct 2004 11:33 #21965

  • poppajoe
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Is there a formula to follow for projector to screen angle? How do you judge set of the projector and screen height?
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Re: Projector to Screen Angle 20 Oct 2004 14:21 #21966

  • rodeojack
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(John P will pitch in if I speak out of turn, but...)

Ideally, you want as little angle as you can get, given the physical limitations of your installation... zero, if you can do it. Any angle, up... down... or side to side will keystone the image on your screen, requiring appropriate filing at the aperture. The more the angle, the more the effect.

In reality, most theatres have a certain amoung of angle, though I haven't seen anything like the way some of the old Vaudeville houses were done up in some time! Some of those booths were way back and waaaaayy up there!
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Re: Projector to Screen Angle 20 Oct 2004 19:31 #21967

  • outaframe
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JACK is right on: the closer to perpendicular vertically and horizontally at dead center of the screen, the better... Besides keystoning, on a really large screen you will experience focus problems as well, which become worse as the projection angle increases... I have seen some really awful installations which were made to accomodate less than ideal conditions, and the resultant picture shows it... A seat-of-the-pants GUESS would be to not exceed 15 degrees from perpendicular in either plane...
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Re: Projector to Screen Angle 22 Oct 2004 13:51 #21968

  • John Pytlak
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Good theatre designs minimize keystone distortion. The Schneider Theatre Design Pro software allows you to predict the result of any given design:
http://www.schneideroptics.com/software/theatre_design_pro/



John P. Pytlak, Senior Technical Specialist
Customer Technical Services
Entertainment Imaging
Research Labs, Building 69, Room 7525A
Eastman Kodak Company
Rochester, NY 14650-1922
Telephone: +1 585-477-5325 Cell: +1 585-781-4036 Fax: +1 585-722-7243
E-Mail: This e-mail address is being protected from spambots. You need JavaScript enabled to view it
Website: http://www.kodak.com/go/motion
John P. Pytlak, Senior Technical Specialist
Customer Technical Services
Entertainment Imaging
Research Labs, Building 69, Room 7525A
Eastman Kodak Company
Rochester, NY 14650-1922
Telephone: +1 585-477-5325 Fax: +1 585-722-7243
E-Mail: This e-mail address is being protected from spambots. You need JavaScript enabled to view it
Website: http://www.kodak.com/go/motion
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