what is an electronic viewfinder
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- Electronic Viewfinders (EVFs) An EVF is basically a very small screen inside a viewfinder, so you can put your eye up to the viewfinder and use it like a traditional camera. On most cameras with EVFs you can switch the view between the viewfinder and the rear LCD screen interchangeably.
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Night vision device A night vision device, also known as night optical/observation device and night vision goggles, is an optoelectronic device that allows images to be produced in levels of light approaching total darkness. The image may be a conversion to visible light of both visible light and near-infrared, while by convention detection of thermal infrared is denoted thermal imaging. The image produced is typically monochrome, e.g. shades of green. NVDs are most often used by the military and law enforcement ag
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Optical mark recognition Optical mark recognition (also called optical mark reading and OMR) is the process of capturing human-marked data from document forms such as surveys and tests.They are used to read questionnaires, multiple choice examination paper in the form of lines or shadded areas.
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Optical mark recognition Optical mark recognition is the process of capturing human-marked data from document forms such as surveys and tests.They are used to read questionnaires, multiple choice examination paper in the form of lines or shadded areas.
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- A rangefinder works by having 2 windows that view the subject a slight distance apart. One creates the direct view image in your viewfinder, the other creates a center spot (a small area superimposed on the main image) that's used to focus-this spot is usually somewhat illuminated.ost varieties of rangefinder show two images of the same subject, one of which moves when a calibrated wheel is turned; when the two images coincide and fuse into one, the distance can be read off the wheel. More on camera rangefinders http://www.ehow.com/how-does_4926163_ran...
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Laser rangefinder These devices have anti-leaf filters and work with reflectors. Laser beam reflects only from this reflector and so exact distance measurement is guaranteed. Laser rangefinders with anti-leaf filter are used for example for forest inventories. Sports
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Moultrie AnnouncesNew Cellular Trail Camera System: Moultrie Mobileâ¢ Moultrie AnnouncesNew Cellular Trail Camera System: Moultrie Mobile™. Moultrie, the market leader in trail cameras and game feeders, introduces Moultrie Mobile™, a technologically advanced trail camera system which allows hunters to view images and control cameras remotely over the internet. Moultrie has partnered with the nation’s leading cellular network for the best possible Moultrie, the market leader in trail cameras and game feeders, introduces Moultrie Mobile™, a technologically advanced trail camera system which allows hunters to view images and control cameras remotely over the internet.
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Cologuard How does Cologuard® work? If cancerous or precancerous tissue is in your colon, those abnormal cells may be picked up by stool as it passes through your colon. Cologuard® is a stool test that uses laboratory technology to find the DNA from these abnormal cells.
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- What Is OMR Software. Optical mark recognition is the process of automatically extracting data from noticeable fields, such as checkboxes and fill-in the fields, on printed forms. Optical mark reader is a complete OMR solution for educational institutions. It is used in every normal scanner to check the answer sheet.
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View camera View camera. (Redirected from Bellows camera) Basic view camera terminology. The view camera is a large format camera in which the lens forms an inverted image on a ground glass screen directly at the plane of the film. The image viewed is exactly the same as the image on the film, which replaces the viewing screen during exposure. This type of camera was first developed in the era of the daguerreotype and still in use today, though with many refinements. It comprises a flexible bellows that forms a light-tight seal between two adjustable standards, one of which holds a
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- (redirected from viewfinder) Also found in: Dictionary, Thesaurus, Financial, Acronyms, Encyclopedia, Wikipedia.
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Telescopic sight A telescopic sight, commonly called a scope, is a sighting device that is based on an optical refracting telescope. They are equipped with some form of graphic image pattern (a reticle) mounted in an optically appropriate position in their optical system to give an accurate aiming point.
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The Multifocal Electroretinogram The Multifocal Electroretinogram. What is the Electroretinogram (ERG)? The electroretinogram (ERG) is a recording of the bioelectric potential, the summed activity of the retinal cells located at the back of the eye, when stimulated by light. When bioelectrical changes occur within the retina, the change is propagated to the surface of the cornea.
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Objective (optics) Objective (optics) In optical engineering, the objective is the optical element that gathers light from the object being observed and focuses the light rays to produce a real image. Objectives can be a single lens or mirror, or combinations of several optical elements. They are used in microscopes, telescopes, cameras, slide projectors, CD players and many other optical instruments. Objectives are also called object lenses, object glasses, or objective glasses
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What is a Digital Oscilloscope? What is a Digital Oscilloscope? A digital oscilloscope is a complex electronic device composed of various software and electronic hardware modules that work together to capture, process, display and store data that represents the signals of interest of an operator.
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Camera Configuration This document describes the camera extensibility features of ESP. The camera system is highly customizable and extensible, enabling add-on providers to create interesting and useful views. There is a distinction between the view system and the camera system. The view system manages the 3D windowing system by tracking the active window, processing keyboard and mouse input and providing methods for opening new windows, selecting windows, etc. The camera system defines what appears in each view window.
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Science View All Sensors. Optical Sensors. A photoelectric sensor, or photoeye, is a device used to detect the distance, absence, or presence of an object by using a light transmitter (often infrared) and a photoelectric receiver.They are used extensively in industrial manufacturing. position sensor is any device that permits position measurement. It can either be an absolute position sensor or a relative one. Position sensors can be either linear or angular.
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Definitions &Translations An autofocus optical system uses a sensor, a control system and a motor to focus fully automatic or on a manually selected point or area. An electronic rangefinder has a display instead of the motor; the adjustment of the optical system has to be done manually until indication.
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Why Using an Optical Viewfinder with Your Camera Can Improve Your Photography Why Using an Optical Viewfinder with Your Camera Can Improve Your Photography. Growing up a rangefinder camera user, I have been using optical viewfinders (OVF) since an early age. They were, metaphorically speaking, my eyes. This is an idea powerfully visualized in Andreas Feininger’s portrait of recently deceased, Magnum photographer Dennis Stock.
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PRODUCT FOCUS: OPTICAL SPECTRUM ANALYZERS: Understanding the latest features in optical spectrum analyzers VALERIE C. COFFEY, contributing editor. An optical spectrum analyzer (OSA) is a wavelength-selective optical power meter that measures signal power versus wavelength (or frequency), tunable over a specified wavelength range somewhere between the ultraviolet and the infrared, depending on the application.
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- Elizabeth Taylor, left, Eddie Fisher and Debbie Reynolds attend the opening of a show starring Fisher at the Tropicana in Las Vegas.ddie Fisher, the '50s singer whose fame was overshadowed by scandals ending his marriages to Debbie Reynolds and Elizabeth Taylor, died Wednesday of complications from hip surgery.
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- A telescopic sight, commonly called a scope, is a sighting device that is based on an optical refracting telescope.he first experiments directed to give shooters optical aiming aids go back to the early 17th century. For centuries different optical aiming aids and primitive predecessors of telescopic sights were created that had practical or performance limitations.
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Electrostatic lens Electrostatic lens. An electrostatic lens is a device that assists in the transport of charged particles.[1][2][3] For instance, it can guide electrons emitted from a sample to an electron analyzer, analogous to the way an optical lens assists in the transport of light in an optical instrument.
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TTL - transistor-transistor logic, Time to Live or through-the-lens (3) Short for through-the-lens it is a name for the LCD screen on a digital camera that shows what is projected onto the sensor by the lens. This is an alternate to using the optical or electronic viewfinder. Also called a TTL viewfinder.
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Laser rangefinder Laser rangefinder. A long range laser rangefinder is capable of measuring distance up to 20 km; mounted on a tripod with an angular mount. The resulting system also provides azimuth and elevation measurements. A laser rangefinder is a rangefinder which uses a laser beam to determine the distance to an object. The most common form of laser rangefinder operates on the time of flight principle by sending a laser pulse in a narrow beam towards the object and measuring the time taken by the pulse to be reflected off the target and returned to the sender. Due to the high speed of light, this technique is not appropriate for high precision sub-millimeter measurements, where triangulation and other techniques
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Accelerometer Inertial navigation system. An inertial navigation system (INS) is a navigation aid that uses a computer, motion sensors (accelerometers) and rotation sensors (gyroscopes) to continuously calculate via dead reckoning the position, orientation, and velocity (direction and speed of movement) of a moving object without the need for external references.