Stops & Pupils

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Optical Design (S15) Joseph A. Shaw – Montana State University Aperture and Field Stops Stops determine the light-collecting area and field of view of an optical system. We can find the stops by tracing two rays called the marginal (or axial) ray and chief (or principal) ray. Aperture stop - limits the area over which light is collected. Field stop - limits the angle from which light is collected (field of view). lens det object FS AS Marginal (axial) ray Ray from the axial point on the object, to the edge (or margin) of the aperture stop, and through the center of the field stop. Chief (principal) ray Ray from the top or bottom of the object, through the center of the aperture stop, and to the edge of the field stop. 1 Optical Design (S15) Joseph A. Shaw – Montana State University Stops in a Camera Nearly always in a camera, the aperture stop is an iris embedded somewhere within the lens system and the field stop is the film or detector (such as a CCD). Iris (AS) det object FS • marginal ray is limited by the iris, not by any of the lens elements. • chief ray passes through center of iris (the aperture stop). • chief ray angle in object space = “field of view” or “field angle” 2 Optical Design (S15) Joseph A. Shaw – Montana State University Pupils Entrance Pupil (EP) - image of the aperture stop in object space. Exit Pupil (XP) – image of the aperture stop in image space. marginal ray AS XP eye (FS) EP To find optical power [W] Exit pupil determines collected by an optical area of image. A tiny system, multiply the exit pupil is hard to incident irradiance [W/m2] align with the eye in a by the entrance pupil area. telescope or binoculars. 3 Optical Design (S15) Joseph A. Shaw – Montana State University Demonstration of Pupils with a Camera Lens View a camera lens from the front and from the back to see the entrance and exit pupils. You are seeing the same iris from both sides, but it appears to be of different diameter because of the intervening optics. Entrance pupil Exit pupil 4 .

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