AVP offers a wide array of screens each with a choice of projection surfaces. Selecting the right combination to meet your needs is important for optimum results. The following pages offer guidelines for selecting a screen that suits your application. Although these recommendations will work in most situations, each must be looked at not as a strict rule, but rather as a guideline for determining your actual needs based on your own situation.

For additional help in selecting screens, contact Da-Lite for the free publications "Selecting Front Projection Screens for Today's Presentation Media Applications" or "Selecting Rear Projection Screens for Today's Presentation Applications". Of course, your Da-Lite Sales Partner is also happy to assist you.

1. Pick the type screen that best suits your particular needs. For example, choose from front projection or rear projection screens in either portable, wall or ceiling mounted models in either manual or electric versions. Generally, if your projection application is permanent, then wall and ceiling screens are your best choice. If, however, you find your needs require moving the screen to different locations, then a portable screen is a better alternative.
2. Determine the optimum screen size based on room dimensions, planned audience seating size and arrangement. The rule of thumb is to fit the screen to the audience - not to the projector Da-Lite recommends the following formula for determining screen size:
   • Screen height should be approximately equal to 1/6 the distance from the screen to the last row of seats, allowing text to be read and detail to be seen in the projected image.
   • Ideally, the first row of seats should be approximately 2 screen heights away.
   • The bottom of the screen should be a minimum of 4 feet above the audience floor, allowing those seated toward the rear of the audience to see the screen. This may require additional screen "drop" for ceiling hung screens.
3. Select the appropriate format for your projection application. Common formats are as follows:

   Common Applications	Aspect Ratio Width/Height
   NTSC Video	1.33
   PAL Video	1.33
   Letter Box Video	1.85
   HDTV Video	1.78
   35 MM Filmstrip	1.32
   2x2 Standard 35MM Double-Frame Slides	1.50

4. Choose the screen surface that best suits your projection and viewing requirements. For your convenience, the front and rear projection pages provide descriptions and performance characteristics for each front and rear screen surface. If the screen will be used for multiple projection methods, choose the screen surface that meets the requirements of the lesser performing projection method. For example, if using a slide projector and a video projector, choose the screen surface for the video projector since its light output is generally less than a slide projector.

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