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Vidikron Vision Model 50 Owner’s Operating Manual
Installation
Rear screen installations
There are two basic types of rear screens: diffused and optical.
A diffusion screen has a surface that spreads the light striking it. Purely diffused screens
have a gain of less than 1. The main advantage of the diffused screen is its wide viewing
angle, similar to that of a flat screen for front screen projection. This type of screen is suitable
when a wide viewing angle is required but there is low ambient room lighting.
Optical screens take light from the projector and redirect it to increase the light intensity
at the front of the screen. This reduces it in other areas. A viewing cone similar to that of a
curved, front-screen installation is created. This type of screen is better suited for brightly
lit rooms where the audience is situated within the viewing cone.
Screen size
Choose a screen size that is appropriate for your lens and application. The size of the room
and viewing distance are the defining factors; a rule of thumb is that the primary viewing
distance be 1.5 times the screen width.
To fill a screen with an image, the aspect ratio of the screen should be equal to the aspect
ratio of the image (expressed as the ratio of its width to its height). Standard video from a
VCR has a 4:3 or 1.33:1 aspect ratio. For example, to display a VCR output with a 4:3 aspect
ratio onto a 10-foot (3.05-meter) high screen, the width of the screen must be at least 13.3
feet (4 meters).