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Entrance pupil

Entrance pupil

Optical image of the physical aperture stop.

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Readers' pathsAug 2026 – Oct 2026

Readers go next to

Share of the 333 clicks on its links

  1. Exit pupil

    Virtual aperture in an optical system.

    44%

  2. Ray (optics)

    Idealized model of light.

    22%

  3. Aperture

    Hole or opening through which light travels.

    16%

  4. Optics

    Branch of physics that studies light.

    3.9%

  5. Pinhole camera

    Type of camera.

    3.6%

  6. Vignetting

    Darkening an image's periphery versus the center.

    3%

Readers come from

Share of the 668 readers arriving from another article

  1. F-number

    Measure of lens speed.

    39%

  2. Aperture

    Hole or opening through which light travels.

    17%

  3. Bokeh

    Aesthetic quality of blur in the out-of-focus parts of an image.

    14%

  4. Pupil

    Part of an eye.

    6.7%

  5. Etendue

    Measure of the "spread" of light in an optical system.

    5.5%

  6. Telecentric lens

    Optical lens.

    4.5%

  7. Numerical aperture

    Characteristic of an optical system.

    3.7%

  8. Coma (optics)

    Aberration inherent to certain optical designs or due to imperfection in the lens.

    3.1%

  9. Visual angle

    Angle an object subtends at the eye.

    1.9%

  10. Ray (optics)

    Idealized model of light.

    1.9%