focusing distance

См. также в других словарях:

• distance learning — n. any system of individualized, esp. postsecondary instruction for students at a distance from a campus, utilizing the Internet, videoconferencing, preprogrammed courses, etc. * * * ▪ education Introduction also called  distance education , e… …   Universalium

• Self-focusing transducers — Acoustic waves emitted by ultrasonics transducer crystals exhibit a property known as self focusing (or natural focusing ). Note that this is distinct from the electronically controlled focusing employed in diagnostic ultrasound devices which… …   Wikipedia

• Hyperfocal distance — In optics and photography, hyperfocal distance is a distance beyond which all objects can be brought into an acceptable focus. There are two commonly used definitions of hyperfocal distance , leading to values that differ only slightly:The first… …   Wikipedia

• Pupillary distance — (PD) is the distance (usually measured in millimeters) between the centers of the pupils in each eye. This measurement is used when making prescription eyeglasses. Positioning lenses correctly in relation to the pupil centers is especially… …   Wikipedia

• Vertex distance — is roughly defined as the distance between a person s glasses (spectacles) and their eyes. Moving the glasses closer or further from the eyes changes the optical properties of the system, including magnification and focusing power (diopters of… …   Wikipedia

• Canon EF lens mount — The EF lens mount allows all the Canon EF lenses to be used on any of the Canon EOS line of cameras made by Canon Inc.Unlike the EF s breech lock predecessor, the FD mount, the EF mount uses a bayonet style mount. EF stands for Electro Focus :… …   Wikipedia

• Rangefinder camera — A Foca camera of 1947 at the Musée des Arts et Métiers in Paris. A rangefinder camera is a camera fitted with a rangefinder: a range finding focusing mechanism allowing the photographer to measure the subject distance and take photographs that… …   Wikipedia

• Macro photography — is close up photography; the classical definition is that the image projected on the film plane (i.e., film or a digital sensor) is close to the same size as the subject. On 35 mm film (for example), the lens is typically optimized to focus… …   Wikipedia

• Pentax ME F — The Pentax ME F was an amateur level, interchangeable lens, 35 mm film, single lens reflex (SLR) camera. It was manufactured by Asahi Optical Co., Ltd. (called PENTAX Corporation since 2002) of Japan from November 1981 to 1984. The ME F was a… …   Wikipedia

• Canon EF 100-300mm f/5.6L — Infobox photographic lenses name = Canon EF 100 300 f/5.6 L maker = Canon feat is = n feat usm = n feat sbf = n feat macro = y feat special = type = z application = L Series telezoom flength = 100 300 mm fov = 1.0 aperture = f/5.6 f/32 groups =… …   Wikipedia

• Rollei 35 — The S designates it has a Sonnar 2,8/40mm lens Ilford 35 mm film cartridge for scale.] The Rollei 35 is a 35mm miniature viewfinder camera built by Rollei. The original Rollei 35, when presented to the public at the photokina in 1966, was the… …   Wikipedia