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Frame 150 from the Zapruder film. Kennedy's limousine has just turned onto Elm Street, moments before the first shot. The Zapruder film is a silent 8mm color motion picture sequence shot by Abraham Zapruder with a Bell & Howell home-movie camera, as United States President John F. Kennedy's motorcade passed through Dealey Plaza in Dallas, Texas, on November 22, 1963.
A projector's throw ratio is used when installing projectors to control the size of the projected display. [1] For example, if the throw ratio is 2:1 and the projector is fourteen feet away from the screen, then the display width will be seven feet.
Simulation of a spinning zoopraxiscope An early projector and seats from a movie theater. The main precursor to the movie projector was the magic lantern.In its most common setup it had a concave mirror behind a light source to help direct as much light as possible through a painted glass picture slide and a lens, out of the lantern onto a screen.
In educational settings, the specific role of the opaque projector has been superseded first by the overhead projector and later the document camera, a lighted table with a fixed video camera above it. The image from the camera is displayed using a separate projector. The document camera is also called a desktop presenter unit or opaque projector.
Zapruder's movie camera was an 8 mm Bell & Howell Zoomatic Director Series Model 414 PD—top-of-the-line when it was purchased in 1962. [citation needed] Zapruder had planned to film the motorcade from his office window but opted for a better spot in Dealey Plaza where the motorcade would be passing. [16]
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.
An overhead projector works on the same principle as a slide projector, in which a focusing lens projects light from an illuminated slide onto a projection screen where a real image is formed. However some differences are necessitated by the much larger size of the transparencies used (generally the size of a printed page), and the requirement ...
All enlargers consist of a light source, normally an incandescent light bulb shining though a condenser or translucent screen to provide even illumination, a holder for the negative or transparency, and a specialized lens for projection, though some, such as the Rapid Rectilinear or Aplanat [citation needed] could be used in both camera and enlarger.