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  2. Ceiling projector - Wikipedia

    en.wikipedia.org/wiki/Ceiling_projector

    The ceiling projector or cloud searchlight is used to measure the height of the base of clouds (called the ceiling) above the ground. It is used in conjunction with an alidade, usually positioned 1000 ft (300 m) away and wherever possible set at the same level. The projector is normally set at 90°, although 71° 31' may be used, in relation to ...

  3. CineAlta - Wikipedia

    en.wikipedia.org/wiki/CineAlta

    In June 1999, George Lucas announced that Episode II of the Star Wars Prequel Trilogy would be the first major motion picture to be shot 100% digitally. Sony and Panavision had teamed up to develop the High Definition 24p camera that Lucas would use to accomplish this, and thus the first CineAlta camera was born: the Sony HDW-F900 (also called the Panavision HD-900F after being "panavised").

  4. Projection clock - Wikipedia

    en.wikipedia.org/wiki/Projection_clock

    A projection clock (also called ceiling clock) is an analogue or digital clock equipped with a projector that creates an enlarged image of the clock face or display on any surface usable as a projection screen, most often the ceiling. [1] The clock can be placed almost anywhere if only the projected image must be seen.

  5. Projection screen - Wikipedia

    en.wikipedia.org/wiki/Projection_screen

    Electric screens can be wall-mounted, ceiling-mounted or ceiling recessed. These are often larger screens, though electric screens are available for home theater use as well. Electric screens are similar to pull-down screens, but instead of the screen being pulled down manually, an electric motor raises and lowers the screen.

  6. Projector - Wikipedia

    en.wikipedia.org/wiki/Projector

    A projector or image projector is an optical device that projects an image (or moving images) onto a surface, commonly a projection screen. Most projectors create an image by shining a light through a small transparent lens , but some newer types of projectors can project the image directly, by using lasers .

  7. IMAX - Wikipedia

    en.wikipedia.org/wiki/IMAX

    IMAX is a proprietary system of high-resolution cameras, film formats, film projectors, and theaters known for having very large screens with a tall aspect ratio (approximately either 1.43:1 or 1.90:1) and steep stadium seating, with the 1.43:1 ratio format being available only in few selected locations.