Also found in: Dictionary, Medical.
a resolution chart or model used in factory and operating testing of motion-picture equipment and camera lenses. Depending on their purpose, test objects may contain various elements, such as a scale for checking the alignment of the boundaries of the frame on the film and in the camera viewfinder, a gray scale for monitoring the constancy of the exposure, and crosshatched and radial test patterns for determining image sharpness and stability. The test objects are placed at a specific distance in front of the lens of the equipment being tested, on a stand with light providing uniform illumination. In certain cases the filming is done in natural light. Low-voltage incandescent lamps are used as test objects for checking the synchronization of the shutter and the intermittent movement. The results of the test filming are judged from the image of the objects produced on the film, using where necessary a magnifying glass, a projector, a densitometer, or a measuring microscope.
A. A. SAKHAROV