Movie Projector : What is it?
| A movie projector is a device used for displaying moving pictures, usually in a movie theater, on a large projection screen. It has optical and mechanical elements similar to a movie camera, except for its sound and illumination components. Its projection elements include a light source (Xenon light), a reflector, a condenser lens, and a douser (or dowser). It projects a series of film images in quick succession with the help of persistence of vision. Persistence of vision is the perceptual process of the brain and retina of the human eye that retains an image for a brief moment, giving the illusion of motion when presented with a quick succession of related still pictures, instead of just seeing them as individual still frames.
Today, almost all commercial movie projectors project at a constant speed of 24 frames per second. This standard speed was initially chosen for financial and technical reasons, as 24 fps is the slowest speed that provides a satisfactory amplification and reproduction of sound. This means less film stock is required, making it cheaper for producers to make a film. |
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Kinds of Movie Projectors include the following: |
8 mm movie projector
- An 8mm movie projector was traditionally used for making home movies before the advent of mini DVs and cassette videos.
- It uses a double sprocket 16 mm film run through the camera twice.
- The 16 mm film is split lengthwise into two 8mm pieces.
- The two pieces are spliced to make a single film with sprockets on one side.
Super 8 movie projector
- A super 8 projector uses super 8 film stock with very small sprocket holes along the edge, allowing more of the film stock to be used for recording images.
- It produces more quality images than an 8 mm movie projector.
- The super 8 film has the same width as the 8mm film. It does not require splitting when run through the projector.
- It can also contain magnetic stripes for carrying encoded sounds that can be added in post-production.
9.5 mm movie projector
- A 9.5 mm projector projects film in the 9.5 mm format.
- It was initially conceived as an inexpensive system to make copies of commercially made films to home users.
- The film has a single sprocket hole between each frame.
- It became very popular in Europe and was sold and produced mainly in England and France.
- Today, they are available as collector’s items.
16 mm movie projector
- A 16 mm projector projects 16 mm film, a format that was popular in schools and high-end home entertainment systems before the advent of broadcast television.
35 mm movie projector
- A 35 mm projector is the most commonly found projector in movie theaters.
- It uses 35 mm film, which is used by most movie directors and cinematographers.
70 mm movie projector
- A 70 mm movie projector is a high-end device that uses 70 mm film.
- Some specialized movie theaters are capable of projecting this type of film.
- It is used in the IMAX projection system.
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Safety: Choose a movie projector that meets the ANSI safety standards for movie projectors. It should also be regulated by your city or local ordinance.
Format: Choose a movie projector that uses a format widely employed by movie productions. Currently, the 35 mm format is still the standard for films.
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