A long-throw projector will require much space between the projector and the projection screen, while a short-throw projector will require a lesser distance. The projector casts lights on the screen.
The screen diffuses the light through itself and directs it towards the viewer at the opposite side. Most times some amount of light is also reflected back to the projector and is lost in the process. Rear projection gives a bright, clear and sharp image, it prevents shadowing when projecting, and it also minimizes the noise from the projector.
This makes it suitable for places like museums, theaters, and churches. In front projection, ambient light affects the image quality.
To get a bright image, the ambient light needs to be reduced. It is the opposite in rear projection; there is a better contrast and image quality when the ambient light is high.
To achieve the best image, make sure that the light hitting the back of the projection screen is controlled or contained mainly behind the screen. For front projection, as the viewer moves further off to the side the image becomes more distorted, and the higher the screen gain, the narrower the optimal viewing angle becomes.
In rear projection, the viewing angle depends on the screen material. That is, it depends on how well the material can diffuse light through itself. Since in rear projection, the projector and other devices are kept behind the screen, there is usually little space available in front of the screen. But in front projection, the projector as well as the other devices is positioned in front of the screen, so there is enough space available, especially when the projector is mounted to the ceiling, or the screen is fixed on the wall, and the speakers or soundbar are placed high on a shelf.
Both projection styles give the same brightness level when done in the right environment, and with the right screen. Front projection does not need a special projection screen; regular screens can be used.
These screens are easy to get, and are readily available in online stores. On the other hand, special screens are required for rear projection. The reason is not far-fetched; rear projection screens work with a more advanced technology compared to front projection screens.
One of the critical factors when deciding between front or rear projection is the amount of space that is available in your venue. Let's look at the space implications of each option in turn:. With front projection, the screen can be placed against a wall since all the equipment will be in front of the screen. The projector can either be positioned on the floor, mounted to the ceiling, or at the back of the room with your other production equipment. Additionally, because the projector can be placed anywhere between a few feet to several yards from the screen, front projection is an excellent option for large audiences and venues.
However, be aware that anything between the projector and screen, such as a presenter standing in front of the screen or structural features like pillars or chandeliers will generate shadows. With this arrangement, everything will be behind the screen; therefore, the screen will need to be placed away from the wall to make room for the equipment.
This option is best suited for larger venues since it does cut down space in the room. The specific amount of space needed behind the screen will vary depending on the size of the screen, projector, and projector lens being used. The advantage, however, is it eliminates any issues with shadows such as people walking in front of the projector.
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