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Chapter 5:
Stops, Pupils, and Windows
Abstract
The limiting opening that controls the size of a light bundle passing through an optical system is called the aperture stop. The aperture stop is usually round. So far we have assumed that the aperture stop is located at the lens, such that the free lens diameter is the stop. Off-axis aberrations are influenced if a separate stop is inserted at a specific place along the optical axis. This fact is applied to minimize such aberrations.
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CHAPTER 5
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