Wide-range TV Zoom Lens
J. Brian Caldwell
Zoom lenses for T V cameras are
required to have a large zoom
range while maintaining high image
quality at a large aperture. These requirements are similar to those for consumer video camera objectives, although the latter tend to sacrifice image quality to attain compactness and low-cost. Since cost, size, and
weight are less important than image quality and zoom range, TV
zooms can be substantially larger and often incorporate one or more abnormal dispersion glass elements to reduce secondary color.
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