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TOPIC: How do you compute screen size?

How do you compute screen size? 22 Jul 2002 20:00 #27851

  • Mike
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We want to move our 2 screens 4' closer to make them bigger somewhat. But how big? What's the process to this?

Michael Hurley
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Re: How do you compute screen size? 23 Jul 2002 00:01 #27852

  • RoxyVaudeville
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4 foot closer to what?

The image size is determined by the aspect ratio and the size of your room (or stage).

If your room is 40' wide and you want a wall to wall screen with a one foot masking you would have 38' left for your scope image. Using the scope aspect ratio of 2.35 to 1 you would then have a picture heigth of 16 1/2' by 38'. You should have a minimum ceiling height of 26' to accomplish that. Your flat image would then be 30' wide and side masking would be needed to properly mask in the sides. If you want to have the same width as scope you would then have a flat image that would be 21' high, now requiring a ceiling with a minimum heigth of 30'.

Once you know the image size that you have available the only other thing you need to know is the distance from the projector to the screen and you can consult lens charts to find out the proper size lenses needed to project the correct image size.

You can put these image sizes under slightly lower ceilings, but I wouldn't recommend it. Actually higher would even be better. I also feel that a 38' screen width is too wide for a 40' room, but it is often done today.
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Re: How do you compute screen size? 23 Jul 2002 14:48 #27853

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Mike,

If you are talking about the Colonial, don't mess with success.

If you are talking about Houlton, you have yet to purchase new screens or lenses so you can do what is right. Leave the screens 4' back. Plan for a screen that fills the room wall to wall for scope. Have a common height and then you will have done film right.
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Re: How do you compute screen size? 23 Jul 2002 15:43 #27854

  • John Pytlak
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Again, go for the best image quality:
http://www.kodak.com/US/en/motion/newsletters/pytlak/

John P. Pytlak, Senior Technical Specialist
Worldwide Technical Services
Entertainment Imaging
Research Labs, Building 69, Room 7525A
Eastman Kodak Company
Rochester, NY 14650-1922
Telephone: 585-477-5325 Cell: 585-781-4036 Fax: 585-722-7243
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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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Re: How do you compute screen size? 23 Jul 2002 16:58 #27855

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The screen was set on the back wall. Directly to its left (on one of 2) and starting dead below the screen is an exit stairs. By moving it out 4 feet we can extend the width by 3-4' and improve the masking as the screen is currently up almost against the ceiling with no place to install masking above it. It's in Houlton. Do you think a 4 foot move will render the lenses unusable?

Michael Hurley
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Re: How do you compute screen size? 24 Jul 2002 09:59 #27856

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Moving the screen closer to the projector will produce a SMALLER image with your current lenses. If you are making the screen bigger and moving it closer, you will need shorter focal length lenses. Use the IscoOptic or Schneider lens calculators to determine the focal lengths you need for the new throw and screen size:
http://www.iscooptic.de/english/downloads/indexdown.php
http://www.schneideroptics.com/software/

Be sure you still have the required exits from your auditorium. Any lighted exit signs should be shielded from shining on the screen.



John P. Pytlak, Senior Technical Specialist
Worldwide Technical Services
Entertainment Imaging
Research Labs, Building 69, Room 7525A
Eastman Kodak Company
Rochester, NY 14650-1922
Telephone: 585-477-5325 Cell: 585-781-4036 Fax: 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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Re: How do you compute screen size? 02 Aug 2002 20:22 #27857

A slightly simpler lens formula is a program called LensCalc that was writeen by Bell Theatre Supply in the UK

Do a online search for it
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Re: How do you compute screen size? 03 Aug 2002 12:15 #27858

  • Mike
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And don't forget the "free" lens calculator that Schneider gives out the conventions. !

We're going 4 feet shorter and the lemnses are looking good and we're side masking them.

Michael Hurley
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Re: How do you compute screen size? 06 Aug 2002 13:24 #27859

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Mike

Sorry I missed this whole topic, because I've been on vacation for the past month. Mind you, I loved the south of France and Barcelona, and didn't think much about bigscreenbiz. Anyway, I've read all the responses to the question, and everyone's given you great advice. Good luck!
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