Servicing projection equipment (1932)

Page scan 000119 from Servicing projection equipment

Record Details:

Title:
Servicing projection equipment
Date:
1932
Publisher:
New York : Mancall Publishing Corp.
Volume:
Servicing projection equipment
Leaf #:
000119
Language:
English
Subjects:
Motion Pictures, Motion Picture Technology
Collection:
Books
Format:
Books
Contributor:
Media History Digital Library
Sponsor:
Media History Digital Library
Coordinator:
Media History Digital Library
Description:
Date Added:
August 15, 2024
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FOCUS 103 FOCUS /. Focus Is Not Sharp: Keystone Effect is Pronounced (a) — Where the projection room location is such as to compel a greater or lesser degree of keystone, out-of -focus projection is always present and cannot be wholly eliminated under the existing conditions. (b) — "Stopping down," or reducing the aperture of the lens, as is done with a hand camera shutter, will, of course, sharpen the focus, but the decreased lens opening also decreases the amount of light projected. If the lenses are clean, and are kept so ; if the focus is the very sharpest the lens will give under the conditions prevailing; and if the lens which is used is the best for throw, light, etc., nothing more can be done to remedy this condition. 2. Focus Appears Sharp From Projection Room, But Is Poor in Parts of Auditorium (a) — In this case, the projection room is located so far from the screen that the projectionist's judgment of the screen focus is affected. Testing