Matches in DBpedia 2016-04 for { <http://dbpedia.org/resource/Aperture> ?p ?o }
- Aperture abstract "In optics, an aperture is a hole or an opening through which light travels. More specifically, the aperture and focal length of an optical system determine the cone angle of a bundle of rays that come to a focus in the image plane. The aperture determines how collimated the admitted rays are, which is of great importance for the appearance at the image plane. If an aperture is narrow, then highly collimated rays are admitted, resulting in a sharp focus at the image plane. If an aperture is wide, then uncollimated rays are admitted, resulting in a sharp focus only for rays with a certain focal length. This means that a wide aperture results in an image that is sharp for things at the correct distance. The aperture also determines how many of the incoming rays are actually admitted and thus how much light reaches the image plane (the narrower the aperture, the darker the image for a given exposure time). In the human eye, the pupil is the aperture.An optical system typically has many openings, or structures that limit the ray bundles (ray bundles are also known as pencils of light). These structures may be the edge of a lens or mirror, or a ring or other fixture that holds an optical element in place, or may be a special element such as a diaphragm placed in the optical path to limit the light admitted by the system. In general, these structures are called stops, and the aperture stop is the stop that determines the ray cone angle, or equivalently the brightness, at an image point.In some contexts, especially in photography and astronomy, aperture refers to the diameter of the aperture stop rather than the physical stop or the opening itself. For example, in a telescope the aperture stop is typically the edges of the objective lens or mirror (or of the mount that holds it). One then speaks of a telescope as having, for example, a 100 centimeter aperture. Note that the aperture stop is not necessarily the smallest stop in the system. Magnification and demagnification by lenses and other elements can cause a relatively large stop to be the aperture stop for the system. In astrophotography the aperture may be given as a linear measure (for example in inches or mm) or as the dimensionless ratio between that measure and the focal length. In other photography it is usually given as a ratio.Sometimes stops and diaphragms are called apertures, even when they are not the aperture stop of the system.The word aperture is also used in other contexts to indicate a system which blocks off light outside a certain region. In astronomy for example, a photometric aperture around a star usually corresponds to a circular window around the image of a star within which the light intensity is assumed.".
- Aperture thumbnail Apertures.jpg?width=300.
- Aperture wikiPageExternalLink www.largeformatphotography.info.
- Aperture wikiPageID "47474".
- Aperture wikiPageLength "27023".
- Aperture wikiPageOutDegree "107".
- Aperture wikiPageRevisionID "707840890".
- Aperture wikiPageWikiLink 135_film.
- Aperture wikiPageWikiLink 35_mm_equivalent_focal_length.
- Aperture wikiPageWikiLink APS-C.
- Aperture wikiPageWikiLink Acutance.
- Aperture wikiPageWikiLink Angle_of_view.
- Aperture wikiPageWikiLink Angular_resolution.
- Aperture wikiPageWikiLink Antenna_aperture.
- Aperture wikiPageWikiLink Aperture_priority.
- Aperture wikiPageWikiLink Astronomy.
- Aperture wikiPageWikiLink Astrophotography.
- Aperture wikiPageWikiLink Barry_Lyndon.
- Aperture wikiPageWikiLink Bellows_(photography).
- Aperture wikiPageWikiLink Bokeh.
- Aperture wikiPageWikiLink Camera_lens.
- Aperture wikiPageWikiLink Canon_EF_lens_mount.
- Aperture wikiPageWikiLink 2.8_1–5x_Macro.
- Aperture wikiPageWikiLink Category:Geometrical_optics.
- Aperture wikiPageWikiLink Category:Observational_astronomy.
- Aperture wikiPageWikiLink Category:Physical_optics.
- Aperture wikiPageWikiLink Category:Science_of_photography.
- Aperture wikiPageWikiLink Collimated_light.
- Aperture wikiPageWikiLink Condenser_(microscope).
- Aperture wikiPageWikiLink Cornea.
- Aperture wikiPageWikiLink Cosina_Voigtländer.
- Aperture wikiPageWikiLink Critical_focus.
- Aperture wikiPageWikiLink Deep_focus.
- Aperture wikiPageWikiLink Depth_of_field.
- Aperture wikiPageWikiLink Diameter.
- Aperture wikiPageWikiLink Diaphragm_(optics).
- Aperture wikiPageWikiLink Encyclopædia_Britannica_Eleventh_Edition.
- Aperture wikiPageWikiLink Entrance_pupil.
- Aperture wikiPageWikiLink Exit_pupil.
- Aperture wikiPageWikiLink Exposure_(photography).
- Aperture wikiPageWikiLink F-number.
- Aperture wikiPageWikiLink Film_format.
- Aperture wikiPageWikiLink Film_grain.
- Aperture wikiPageWikiLink Film_plane.
- Aperture wikiPageWikiLink Film_speed.
- Aperture wikiPageWikiLink Focal_length.
- Aperture wikiPageWikiLink Focus_(optics).
- Aperture wikiPageWikiLink 64.
- Aperture wikiPageWikiLink Half-frame_camera.
- Aperture wikiPageWikiLink Human_eye.
- Aperture wikiPageWikiLink Illuminance.
- Aperture wikiPageWikiLink Image_circle.
- Aperture wikiPageWikiLink Image_plane.
- Aperture wikiPageWikiLink Image_scanner.
- Aperture wikiPageWikiLink Image_sensor.
- Aperture wikiPageWikiLink Iris_(anatomy).
- Aperture wikiPageWikiLink Large_format_(photography).
- Aperture wikiPageWikiLink Lens_(optics).
- Aperture wikiPageWikiLink Lens_speed.
- Aperture wikiPageWikiLink Lensbaby.
- Aperture wikiPageWikiLink Light.
- Aperture wikiPageWikiLink Lyot_stop.
- Aperture wikiPageWikiLink Macro_photography.
- Aperture wikiPageWikiLink Micro_Four_Thirds_system.
- Aperture wikiPageWikiLink Mirror.
- Aperture wikiPageWikiLink Numerical_aperture.
- Aperture wikiPageWikiLink Objective_(optics).
- Aperture wikiPageWikiLink Optical_aberration.
- Aperture wikiPageWikiLink Optical_microscope.
- Aperture wikiPageWikiLink Optics.
- Aperture wikiPageWikiLink Pentax_Spotmatic.
- Aperture wikiPageWikiLink Perspective_control_lens.
- Aperture wikiPageWikiLink Photographic_film.
- Aperture wikiPageWikiLink Photography.
- Aperture wikiPageWikiLink Photometry_(astronomy).
- Aperture wikiPageWikiLink Pinhole_camera.
- Aperture wikiPageWikiLink Pupil.
- Aperture wikiPageWikiLink Ray_(optics).
- Aperture wikiPageWikiLink Sampling_(signal_processing).
- Aperture wikiPageWikiLink Shallow_focus.
- Aperture wikiPageWikiLink Shutter_speed.
- Aperture wikiPageWikiLink Single-lens_reflex_camera.
- Aperture wikiPageWikiLink Sony_Cyber-shot_DSC-RX10.
- Aperture wikiPageWikiLink Stanley_Kubrick.
- Aperture wikiPageWikiLink Star.
- Aperture wikiPageWikiLink Telephoto_lens.
- Aperture wikiPageWikiLink Telescope.
- Aperture wikiPageWikiLink Through-the-lens_metering.
- Aperture wikiPageWikiLink Vignetting.
- Aperture wikiPageWikiLink Zh-classical:光圈.
- Aperture wikiPageWikiLink File:16_minolta_50mm.jpg.
- Aperture wikiPageWikiLink File:ApertureDefn1707.png.
- Aperture wikiPageWikiLink File:Aperture_diagram.svg.
- Aperture wikiPageWikiLink File:Aperture_in_Canon_50mm_f1.8_II_lens.jpg.
- Aperture wikiPageWikiLink File:Apertures.jpg.
- Aperture wikiPageWikiLinkText "1.6" to 4"".
- Aperture wikiPageWikiLinkText "Aperture Gallery".
- Aperture wikiPageWikiLinkText "Aperture range".
- Aperture wikiPageWikiLinkText "Aperture".
- Aperture wikiPageWikiLinkText "Aperture#Optimal aperture".