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- Entrance_pupil abstract "In an optical system, the entrance pupil is the optical image of the physical aperture stop, as 'seen' through the front of the lens system. The corresponding image of the aperture as seen through the back of the lens system is called the exit pupil. If there is no lens in front of the aperture (as in a pinhole camera), the entrance pupil's location and size are identical to those of the aperture. Optical elements in front of the aperture will produce a magnified or diminished image that is displaced from the location of the physical aperture. The entrance pupil is usually a virtual image: it lies behind the first optical surface of the system.The geometric location of the entrance pupil is the vertex of the camera's angle of view and consequently its center of perspective, perspective point, view point, projection centre or no-parallax point. This point is important in panoramic photography, because the camera must be rotated around it in order to avoid parallax errors in the final, stitched panorama. Panoramic photographers often incorrectly refer to the entrance pupil as a nodal point, which is a different concept. Depending on the lens design, the entrance pupil location on the optical axis may be behind, within or in front of the lens system; and even at infinite distance from the lens in the case of telecentric systems.In photography, the size of the entrance pupil (rather than the size of the physical aperture itself) is used to calibrate the opening and closing of the diaphragm aperture. The f-number (\"relative aperture\"), N, is defined by N = f/EN, where f is the focal length and EN is the diameter of the entrance pupil. Increasing the focal length of a lens (i.e., zooming in) will usually cause the f-number to increase, and the entrance pupil location to move further back along the optical axis.The entrance pupil of the human eye, which is not quite the same as the physical pupil, is typically about 4 mm in diameter. It can range from 2 mm (f/8.3) in a very brightly lit place to 8 mm (f/2.1) in the dark.".
- Entrance_pupil thumbnail Apertures.jpg?width=300.
- Entrance_pupil wikiPageExternalLink v=onepage&q=&f=false.
- Entrance_pupil wikiPageID "3166565".
- Entrance_pupil wikiPageLength "6043".
- Entrance_pupil wikiPageOutDegree "26".
- Entrance_pupil wikiPageRevisionID "629600783".
- Entrance_pupil wikiPageWikiLink Angle_of_view.
- Entrance_pupil wikiPageWikiLink Aperture.
- Entrance_pupil wikiPageWikiLink Cardinal_point_(optics).
- Entrance_pupil wikiPageWikiLink Category:Geometrical_optics.
- Entrance_pupil wikiPageWikiLink Category:Science_of_photography.
- Entrance_pupil wikiPageWikiLink Diaphragm_(optics).
- Entrance_pupil wikiPageWikiLink Exit_pupil.
- Entrance_pupil wikiPageWikiLink Eye.
- Entrance_pupil wikiPageWikiLink F-number.
- Entrance_pupil wikiPageWikiLink Focal_length.
- Entrance_pupil wikiPageWikiLink Image_stitching.
- Entrance_pupil wikiPageWikiLink Magnification.
- Entrance_pupil wikiPageWikiLink Optics.
- Entrance_pupil wikiPageWikiLink Panoramic_photography.
- Entrance_pupil wikiPageWikiLink Parallax.
- Entrance_pupil wikiPageWikiLink Pinhole_camera.
- Entrance_pupil wikiPageWikiLink Pupil.
- Entrance_pupil wikiPageWikiLink Pupil_magnification.
- Entrance_pupil wikiPageWikiLink Telecentric_lens.
- Entrance_pupil wikiPageWikiLink Transmittance.
- Entrance_pupil wikiPageWikiLink Vertex_(geometry).
- Entrance_pupil wikiPageWikiLink Virtual_image.
- Entrance_pupil wikiPageWikiLink File:030608_Pupil.jpg.
- Entrance_pupil wikiPageWikiLink File:Apertures.jpg.
- Entrance_pupil wikiPageWikiLinkText "Entrance pupil".
- Entrance_pupil wikiPageWikiLinkText "entrance pupil".
- Entrance_pupil wikiPageWikiLinkText "entrance".
- Entrance_pupil wikiPageWikiLinkText "entrance-pupil".
- Entrance_pupil wikiPageWikiLinkText "no parallax point".
- Entrance_pupil wikiPageWikiLinkText "pupil diameter".
- Entrance_pupil wikiPageWikiLinkText "pupils".
- Entrance_pupil wikiPageUsesTemplate Template:F.
- Entrance_pupil wikiPageUsesTemplate Template:For.
- Entrance_pupil subject Category:Geometrical_optics.
- Entrance_pupil subject Category:Science_of_photography.
- Entrance_pupil hypernym Image.
- Entrance_pupil type Work.
- Entrance_pupil type Redirect.
- Entrance_pupil comment "In an optical system, the entrance pupil is the optical image of the physical aperture stop, as 'seen' through the front of the lens system. The corresponding image of the aperture as seen through the back of the lens system is called the exit pupil. If there is no lens in front of the aperture (as in a pinhole camera), the entrance pupil's location and size are identical to those of the aperture.".
- Entrance_pupil label "Entrance pupil".
- Entrance_pupil sameAs Q359518.
- Entrance_pupil sameAs Intreepupil.
- Entrance_pupil sameAs Indgangspupil.
- Entrance_pupil sameAs Eintrittspupille.
- Entrance_pupil sameAs 입사동공.
- Entrance_pupil sameAs Intree-_en_uittreepupil.
- Entrance_pupil sameAs Punkt_bez_paralaksy.
- Entrance_pupil sameAs m.08wmpy.
- Entrance_pupil sameAs Входной_зрачок.
- Entrance_pupil sameAs Giriş_açıklığı.
- Entrance_pupil sameAs Q359518.
- Entrance_pupil wasDerivedFrom Entrance_pupil?oldid=629600783.
- Entrance_pupil depiction Apertures.jpg.
- Entrance_pupil isPrimaryTopicOf Entrance_pupil.