Navitar Support

Front Projection

Front projection is when a projection unit sits in front of the screen.

• Front projection can generally provide a wider viewing angle than rear projection.
• It requires controlled lighting and ambient light must be kept off the screen to eliminate a reduction in contrast ratio.
• Requires either a projection room at the rear of the room, or a platform or mount for the projection within the room.
• The projector position must be considered to find the best compromise between image keystoning and blockage of the light path by the audience.
• Projector must have adequate ventilation and be accessible for maintenance

Rear Projection

Projecting an image through a translucent screen material for viewing from the opposite side. With rear projection, the projector is placed behind the screen, invisible to the audience. It projects onto the screen and the audience sees the image on the other side. Since the image is projected through the screen, the image must be reversed. Good rear projection screens actually produce brighter images than some standard screens. Ideally a projector with a short throw lens is used to avoid wasting space behind the screen. The projector can be placed even with the middle of the screen, without blocking anyone's view, so keystoning is not a problem.

• Rear projection generally has a narrower viewing angle than front projection, making it better for long, narrow rooms.
• Can be viewed with higher levels of room illumination and is less likely to "wash-out" by ambient lighting.
• rear projection screens are available in flexible and rigid materials. A rigid screen is more expensive than a front projection screen and has size restrictions.
• Requires space behind the screen. A short throw lens or mirrors may be used to reduce the required depth.
• Projector must have adequate ventilation and be accessible for maintenance.

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