Copy to Wikimedia Commons Summary Information Description block diagrams of the first telephoto photographic camera lenses. Source By Paul Chin User paul1513 paul1513 User talk paul1513 talk self created Date Author Paul Chin User paul1513 paul1513 User talk paul1513 talk Permission other versions Licensing self cc by sa 3.0 GFDL migration redundant ... more details
wiktionarypar lensLens or Lense may refer to TOC right Optics Lens optics , an optical element which converges or diverges light Lens anatomy , a part of the eye Corrective lens for correction of human vision Contact lens , placed on the cornea of the eye Photographic lens , a lens designed for use on a camera Focusing of other radiation and forces Gravitational lens , a massive astronomical object Electrostatic lens , a device used to focus or collimate electron beams Explosive lens , a shaped explosive charge with focused blast Microwave lens , used to focus microwave radiation in slotted waveguide antennas Lentil shaped things Lens genus , the genus of the lentil plant Lens geometry , a geometric shape formed from two arcs Lens geology , a body of ore or rock that is thick in the middle and thin at the edges Lens hydrology , a layer of fresh water derived from rainfall, overlying saline groundwater Places Arrondissement of Lens , in the d partement of Pas de Calais, France Lens, Pas de Calais , a commune in that arrondissement RC Lens , its football soccer club Lens, Belgium Lens, Valais , Switzerland People Louis Lens , Flemish rose breeder Nicholas Lens , Belgian composer Josef Lense , physicist Other uses Laser engineered net shaping , a rapid prototyping technology capable of building fully dense metal parts Perspective cognitive Lens, a fictional alien device in E. E. Smith s Lensman series disambig surname ar cs o ka de Lens es Lente desambiguaci n eo Lenso fr Lentille ko hr Le a it Lens he lb L ns nl Lens nn Linse no Linse pl Soczewka ujednoznacznienie pt Lens desambigua o ru sco Lens simple Lens disambiguation sk o ovka sv Lens th tr Lens uk vo Lens ... more details
of Focus optics focus or aperture , as these are achieved by the controls on the primary lens. Lenses used in front of the primary lens Examples of secondary lenses designed to be used in front of the primary lens are Fisheye lens Fisheye adaptors Corrected wide angle lens wide angle adaptors Telephoto adaptors such as teleside converter s Close up lens es All of these typically mount on the filter ring of the primary lens. Front mounting secondary lenses are commonly used to provide wide angle and telephoto lenses for cameras which lack the facility to change the primary lens, such as consumer ...Primary lens redirects here. See also prime lens . In photography , a secondary lens is a photographic lenslens designed to be used in conjunction with another lens, called the primary lens . A secondary lens may be designed to be used either in front of the primary lens, between it and the subject, or behind the primary lens, between it and the film. Secondary lenses are typically simpler in mechanical ... the primary lens Teleconverters main teleconverter The most common secondary lens used behind the primary lens is the teleconverter . A typical teleconverter has a male and a female lens mount of the same type, to allow it to be used between a primary lens and a camera body of the matching system. The resulting combination has a greater focal length than the primary lens alone, and the same absolute ..., and when used in this combination deliver quality comparable to the primary lens. Others are general purpose, and in use typically offer less image quality then a primary lens of the same quality ... adaptor, as the angle of view of the primary lens is matched to the film format for which is designed ... to use the primary lens for wider angles than those for which it is designed is therefore likely to cause ... lens to adapt a lens of one camera system and or film format to another. These are called active adaptors or converters. For example, a Pentax screw mount lens cannot normally be mounted on a Nikon ... more details
Unreferenced date March 2008 File Lens flare scheme en.svg thumb right 400px Scheme of lens flare. Lens hood is designed in the way that it does not block the angle of view of the lens. Lens hoods block the sun or other light source in order to prevent glare and lens flare. Image Tulip Lens Hood.jpg thumb right 200px Lens hood. In photography , a lens hood or lens shade is a device used on the end of a photographic lenslens to block the sun or other light source in order to prevent glare vision glare and lens flare . The geometry of the lens hood can vary from a plain conical section much like ... , which prevents the hood from blocking the field of view of the lens and producing vignetting . Flower shaped lens hoods are most often used on zoom lenses as a normal lens hood may block the field of view on some zoom settings. Lens hoods are more prominent in long focus lens es because the field of view has a smaller Angle of view viewing angle than of wide angle lens es. For wide angle lenses, the length of the hood away from the end of the lens cannot be as long as those for telephoto lenses because of the viewing angle. Lens hoods are often designed to fit onto the matching lens facing either forward, for normal use, or backwards, so that the hood may be stored with the lens without occupying much additional space. Some lens hoods are flexible and collapse for storage. In addition, they offer some physical protection for the lens due to the hood extending farther than the lens itself. gallery File Canon EF 70 200mm F2.8L lens with hood.jpg A lens hood used on the Canon EF 70 200mm lens . Note that from this angle no part of the glass lens surface is visible, as the line of sight is blocked by the lens hood. File Canon EF 28 105 3.5 4.5 USM II with and without Lens Hood.jpg Canon lens without and with hood. File Sonnenblende.jpg Praktica camera lens with lens hood. gallery See also Lens cover Matte box similar, adjustable device used in still photography and video Barn ... more details
of a photographic lens it is attached to, making it a telephotolens . Many telephotolens designs use a configuration similar to a Barlow lens to obtain a shorter tube length for a given focal length. Microscope use In microscopy the Barlow lens is used to increase working distance and decrease magnification ...Image Barlow lens.svg thumb Beam of light without red and with green a Barlow lens The Barlow lens , named for its creator, the English engineer Peter Barlow mathematician Peter Barlow , is a diverging lens optics lens which, used in series with other optics in an optical system, increases the effective focal ratio of an optical system as perceived by all components after it in the system. The practical result is that inserting a Barlow lens magnifies the image. Telescope use In its astronomy astronomical use, a Barlow lens may be placed immediately before an eyepiece to effectively decrease the eyepiece s focal length by the amount of the Barlow s divergence. ref cite book last Hartshorn first C. R. editor first Albert G. editor last Ingalls editorlink Albert Graham Ingalls title Amateur Telescope ... 286 chapter The Barlow Lens isbn ref Since the magnification provided by a telescope and eyepiece ... available. The power of an adjustable Barlow lens is changed by adding an extension tube between ... than the distance between the Barlow lens and the eyepiece lens, when the distance is measured in units of the focal length of the Barlow lens. A standard Barlow lens is housed in a tube that is one Barlow focal length long, so that a focusing lens inserted into the end of the tube will be separated from the Barlow lens at the other end by one Barlow focal length, and hence produce a 2x magnification ... lens tube is doubled, the lenses are separated by 2 Barlow focal lengths and it becomes a 3x Barlow ... on Barlow lens that have been adapted for photographic use ref http books.google.com books?id AEFPNfghI3QC ... Teleconverter References reflist DEFAULTSORT Barlow Lens Category Lenses de Barlowlinse fa ... more details
with telephotolens es, those with a narrow angle of view. Some zoom lenses are telephoto, some are wide angle lens wide angle , and others cover a range from wide angle to telephoto. Lenses ... patent s for telephoto lenses also included movable lens elements which could be adjusted to change the overall focal length of the lens. Lenses of this kind are now called Varifocal lens varifocal ... is that at the extreme telephoto setting of the lens the effective focal length changes significantly ... Telephotolens Prime lens Wide angle lens Superzoom Focus attributes Parfocal lens Varifocal lens ...Image Nikkor 28 200 zoom.jpg thumb Nikkor 28 200 mm zoom lens, extended to 200 mm at left and collapsed to 28 mm focal length at right A zoom lens is a mechanical assembly of lens optics lens elements ... FFL lens see prime lens . They are commonly used with still camera still , video camera video , motion ... s, telescope s, telescopic sight s, and other optical instrument s. A true zoom lens, also called a parfocal lens , is one that maintains focus when its focal length changes. A lens that loses focus during zooming is more properly called a varifocal lens . Applications Image Zoom effect.jpg thumb 300px A photograph taken with a zoom lens, in which the focal length was varied during the course of the exposure .... For example, a zoom lens with focal lengths ranging from 100 mm to 400 mm may be described as a 4 ... quality on par with prime lens es, and constant fast aperture zooms usually f 2.8 or f 2.0 are typically ... focal length lens as the popular one lens selection on many contemporary cameras. Some digital cameras ... length zoom lens narrower angle of view . This is commonly known as digital zoom and produces an image .... In addition to its photographic use, the Afocal system afocal part of a zoom lens can be used as a optical ... refocusing of the lens after each change. The first true zoom lens, which retained near sharp focus while the effective focal length of the lens assembly was changed, was patented in 1902 by Clile ... more details
Image 1ds tair11.jpg thumb right 250px A Tair 11 lens mounted on a Canon EOS 1Ds Tair is the name of a series of prime lens es manufactured by Zenit camera Zenit in the Soviet Union . Tair 11 Image Tair11a.jpg thumb right A Tair 11A. Note the number of aperture blades. The Tair 11 series have a focal length of 135mm with a maximum aperture of f number f 2.8 ref cite web url http www.ussrphoto.com wiki default.asp?WikiCatID 106&ParentID 2&ContentID 780&Item Tair 11A title USSR Photo accessdate 2010 10 16 ref . Variants include the Tair 11A for the M42 lens mount and the original Tair 11 for the M39 lens mount . The Tair 11 T is a tropicalized version for aerial photography ref cite web url http www.ussrphoto.com wiki default.asp?WikiCatID 106&ParentID 2&ContentID 1101&Item Tair 11 T title USSR Photo accessdate 2010 10 16 ref . The Tair 11 2 is an M42 lens mount M42 lens with a focal length of 133mm ref cite web url http www.ussrphoto.com wiki default.asp?WikiCatID 106&ParentID 2&ContentID 1089&Item Ta 26 23239 3Br 11 2D2 title USSR Photo accessdate 2010 10 16 ref . A unique feature of the Tair 11 series is the twenty Diaphragm optics aperture blades ref cite web url http www.pentaxforums.com userreviews Tair 11A 135mm F2.8 for Pentax.html title Pentax Forums reviews accessdate 2010 10 16 ref , far more than many modern lenses. Tair 3 Image Photosniper assembled.jpg thumb Photosniper 12S with Tair 3 lens mounted The Tair 3 is a 300mm f 4.5 telephotolens ref cite web url http userpage.fu berlin.de tobiko tair.html title Tobi s Camera Page accessdate 2010 10 16 ref . Like many other Tair lenses, it uses the M42 lens mount . Although these are mostly black coloured lenses, there exist some very rare light grey ones manufactured earlier ref cite web url http www.techtheman.com search label Photosniper title Hin s Tech Corner accessdate 2010 10 16 ref . The lens enjoys a reputation of having excellent image quality References Reflist DEFAULTSORT Tair Lens Category Photographic ... more details
A kit lens is a starter photographic lenslens which can be sold with an interchangeable lens camera such as a single lens reflex camera . The kit consists of the camera body, the lens, and various accessories usually necessary to get started in SLR photography. A kit lens can be sold by itself ie not in a kit. It is generally an inexpensive lens priced at the lowest end of the manufacturer s range so as to not add much to a camera kit s price. Originally kit lenses were of normal lens normal focal length more recently kit lenses tend to be inexpensive zoom lens es that range from medium wide angle lens wide angle to mid telephotolenstelephoto for added versatility. Prime lens es are generally ... number lens is used. This is because in most cases prime lenses are faster than comparably priced zoom lenses. However in most cases the inclusion of an inexpensive zoom lens is to maintain a low entry ... with a lens, as the buyer is assumed to already own lenses or to plan to purchase them separately. Digital single lens reflex cameras Because of the crop factor , kit lenses for APS C format cameras like Canon EF S lens mount Canon EF S and Nikon DX format Nikon DX have shorter focal lengths, to get the same field of view . Canon Canon EF S 18 55mm lens common on consumer level cameras series known as Rebel in the United States , such as Canon EOS 400D 400D Canon EF S 18 55mm IS lens Replaced the original ... EF S 17 85mm lens Canon EOS 30D , Canon EOS 40D 40D , option on Canon EOS 400D 400D Canon EF 24 105mm lens Canon EOS 5D 5D , Canon EOS 5D Mark II 5D Mark II Canon EF 28 105mm lens Alternative lens Canon EF 28 80mm lens Kit lens for film body Canon Canon EOS Elan Elan series. The original version of this lens metal mount, FTM is considered a vastly superior lens to later versions, however both were included as kit lenses. Canon EF S 15 85mm lens Canon EOS 7D 7D Canon EF S 18 135mm lens Canon EOS 7D 7D , Canon EOS 550D 550D , Canon EOS 60D 60D Canon EF S 18 200mm lens Canon EOS 50D 50D Nikon ... more details
, page 294 ref Angle of view is narrower. The most common type of long focus lens is the telephoto ... lens, and a telephoto, which contain exactly the same image size by changing the distance from the subject ... the same view, the pictures will have identical perspective. A moderate long focus telephotolens is often ... 13. ref ref Kraszna Krausz, p 439. ref ref Ray, Photographic Lens. p 83. ref The telephotolens main Telephotolens Image telephoto text.svg right thumb Dallmeyer and Miethe telephotos Image BuschBisTelar .... A telephotolens is made physically shorter than its nominal focal length by pairing a front positive ... established and no patent was ever granted for the first telephotolens. ref Kingslake, pp 133 .... The first telephotolens optically corrected and fixed as a system was the f 8 Busch Bis Telar ... popular as a telephotolens q.v. design the Sonnar is always at least slightly telephoto because ... thumb Different kinds of camera lenses, including wide angle, telephoto and speciality A camera lens also known as photographic lens , objective lens or photographic objective is an optics optical lens optics lens or assembly of lenses used in conjunction with a camera body and mechanism to make ... or electronically. While in principle a simple lens simple convex lens will suffice, in practice a compound lens made up of a number of optical lens optics lens elements is required to correct as much as possible the many optical aberration s that arise. Some aberrations will be present in any lens system. It is the job of the lens designer to balance these out and produce a design that is suitable ... a lens used for a still camera , a video camera , a telescope , a microscope , or other apparatus, but the detailed design and construction are different. A lens may be permanently fixed to a camera ... from an object pass through a small hole to form an image. Typical rectilinear lens es can be thought of as improved pinhole camera pinhole lens es. As shown, a pinhole lens uses a tiny aperture to block ... more details
Image lensspeed.jpg frame right A fast prime fixed focal length lens, the Canon 50mm f 1.4 left , and a slower zoom lens, the Canon 18 55mm f 3.5 5.6 right this lens is faster at 18mm than it is at 55mm. main Aperture Lens speed refers to the maximum aperture diameter, or minimum f number , of a photographic lens . A lens with a larger maximum aperture that is, a smaller minimum f number is a fast lens because it delivers more light intensity illuminance to the focal plane , allowing a faster shutter ... intensity and requires a slower shutter speed. A lens may be referred to as fast or slow depending ... format . Lens speed given by the minimum f number , or alternatively maximum aperture diameter or maximum numerical aperture , is a useful quantitative way to compare similar lenses. Lens speed is important in taking pictures in dim light, or with long telephoto lenses. For controlling depth of field ... 2004 Media Publishing ref , lens speed is a key variable in combination with other variables such as focal ... than one another using this same method. A lens with a maximum aperture of f 3.5 link yes is faster than one with an aperture of f 5.6, though neither is especially fast. A lens with an aperture of f 1.8 is slower than a lens with an aperture of f 1.2, though both are fast lenses. The range of lenses considered fast has evolved to lower f numbers over the years, due to advances in lens design , optical ... mm cameras, the fastest lenses are typically in the normal lens range near 50 mm. Longer telephoto designs and wide angle retrofocus designs tend to be slower. Attaining maximum lens speed requires engineering tradeoffs, and as such, prime lens prime fixed focal length lenses are generally faster than zoom lens es, and modern manual focus lenses are generally faster than their autofocus ... 2.8 or slower f 1.0 is unusual, though sees some use. Lens speed also tends to correlate with the price and or quality of the lens. This is because lenses with larger maximum apertures require greater ... more details
Image Pentacon electric f2,8 29mm MC lens.jpg thumb right A 29mm prime lens accompanied by a diagram of its internal lens elements. Image Canon 85mm comparison front .jpg thumb right Prime lenses can have ... 1.8 link yes left and f 1.2 right . In film and photography, a prime lens is either a photographic lens whose focal length is fixed , as opposed to a zoom lens , or it is the primary lens in a combination lens system. Confusion can sometimes result due to the two meanings of the term if the context ... , and FFL are sometimes used to avoid ambiguity. As alternative to zoom lens The term prime has come to be used as the opposite of Zoom lens zoom that is, a prime lens is a fixed focal length, or unifocal lens, while a zoom lens has a variable focal length. ref cite book title The Super 8 Book author ...?id mjkB1hMZZtoC&pg PA32&dq 22prime lens 22 22zoom lens 22 fixed focal length&lr &as brr 3&ei 6duvR9zgLZGOswPUrImgAw&sig evtOHziEGHRTBWdbOXgypNLhNMk ref A prime lens of a given focal length is less versatile ..., lighter weight, smaller bulk and lower cost. In comparison with a zoom lens, a prime lens has fewer moving parts and optimization for one particular focal length. With a less complicated lens formula ... photography in lower light and a shallower depth of field . A normal lens or normal prime is a lens ... meaning as primary lens An alternate and apparently somewhat older meaning of the term prime lens is the main lens in a combination lens system. ref cite book title The British Journal of Photography ... books?id ZIAqAAAAMAAJ&q prime lens date 0 1950&dq prime lens date 0 1950&lr &as brr 0&ei M WvR5rJJ5aytgOZsuSDBg&pgis 1 ref When the camera lens is used with some other optical device, such as a close up lens , teleconverter , or teleside converter , the camera lens itself is properly called the prime lens . Prime is here used in the sense of primary, chief, original, first in order, etc. Lens manufacturers ... of the term prime lens is an example of a retronym . Early in photography only primary camera lenses ... more details
seen in large Long focus lens long focus or telephotolens es to reduce strain on the lens mount ...Views In photography , a fisheye lens is a wide angle lens that takes in an extremely wide, Sphere hemispherical image. Originally developed for use in meteorology ref Hill, R. 1924. A lens for whole sky ... easily be corrected for moderately wide angle of view angles of view , rectilinear lens rectilinear .... A panorama by rotating lens or stitching images cylindrical perspective is not a fisheye photo. Types of fisheye lenses In a circular fisheye lens , the image circle is inscribed in the film or sensor area in a full frame fisheye lens the image circle is circumscribed around the film or sensor area ... lens Image taken using a circular fisheye lens. The first types of fisheye lenses to be developed ... ref The first full frame fisheye lens to be mass produced was a 16 mm lens made by Nikon in the early 1970s. Digital cameras with APS C sized sensors require a 10.5 mm lens to get the same effect as a 16 mm lens on a camera with full frame sensor. ref http www.nikonusa.com template.php ... 170px Image Fisheye lens room.jpg Fisheye 15mm type equisolid angle , 35mm film, cropped by slide ... to rectangle. Image Nikon 16 fisheye.jpg A full frame fisheye lens for a 35mm camera. File Peleng8.jpg A Peleng Lens Peleng 8mm f 3.5 Lens. gallery Miniature fisheye lenses Miniature fisheye lenses ... on the imager active area, the same lens can form a circular image on one imager e.g. 1 2 , and a full frame on the other e.g. 1 4 . Focal length Sigma currently makes a 4.5mm fisheye lens that captures ... lens that captures a circular 185 degree field of view on a 1.5x Nikon and 1.6x Canon DSLR cameras. Nikon produced a 6 mm circular fisheye lens that was initially designed for an expedition to Antarctica ... ground when pointed straight up. This lens is no longer manufactured by Nikon, ref cite web url http ... Information on Fisheye Nikkor 6mm f 2.8 lens publisher Malaysian Internet Resources accessdate 2008 ... more details
In photography and cinematography a normal lens is a photographic lenslens that reproduces perspective that generally looks natural to a human observer under normal viewing conditions, as compared with lenses with longer or shorter focal lengths which produce an expanded or contracted field of view. Lenses of shorter focal length are called wide angle lens es , while longer focal length lenses are referred to as long focus lens es ref http books.google.com books?id sbdGeFem1zwC&pg PA71&dq 22normal lens 22 22long focus 22&hl en&ei f 3 TOXVAcKB8gaHsLWHBw&sa X&oi book result&ct result&resnum 8&ved 0CE0Q6AEwBw v onepage&q 22normal 20lens 22 20 22long 20focus 22&f false Bruce Warren, Photography, page 71 ref with the most common of that type being the telephotolens es . A lens with a focal length about equal to the diagonal size of the film or sensor format is known as a normal lens its angle ...&dq appear normal focal length lens print size diagonal viewer distance postscript none ref this angle ... lens focal length 9.5 mm Minox 8 11 mm 13.6 mm 15 mm Half frame 24 18 ... mm camera with a diagonal of 43 mm, the most commonly used normal lens is 50 mm, but focal ... value and good sharpness visual sharpness , as Lens optics lens technology at the time ... of view depends on the aspect ratio as well a normal lens on 35mm does not have the same view as a normal lens on 645, for example. Digital still In digital photography , the sensor type is not the sensor diameter refers to TV tube diameters that were standards in the 50s. The normal lens focal ... Image diagonal Normal lens focal length 1 3.6 7.1 mm 4.0 3.0 mm 5.0 mm 5 mm ... wikitable Film format Image dimensions Image diagonal Normal lens focal length 8 mm film Standard ... Photographic lens References reflist Category Photographic lenses cs Norm ln objektiv da Normalobjektiv ... Obiektyw standardowy pt Objetiva normal ru simple Normal lens sk Norm lny objekt v ... more details
Unreferenced date August 2009 A Celor lens is a highly corrected photographic lenslens of the Dialyt lens Dialyt type, designed for process photography , involving reproduction at or near 1 1 scale. DEFAULTSORT Celor Lens Category Photographic lenses optics stub ... more details
Unreferenced date December 2009 Image Canon EFS 18 to 55 m lense covers.JPG thumb Canon company Canon lens covers. File 62mm lens cap.jpg thumb Screw in metal lens cap A lens cover or lens cap provides protection from scratches and minor collisions for camera and camcorder photographic lens lenses . Lens covers come standard with most cameras and lenses. Some mobile camera phone s include lens covers, such as the Sony Ericsson W800 , the Sony Ericsson K750 and the Sony Ericsson K550 . A more secure lens cap is the metal screw in lens cap which cannot pop off a lens accidentally. Although a screw in cap takes more time to remove in order to take a photograph than a standard lens cap, it is stronger than plastic and therefore more protective. See also Lens hood DEFAULTSORT Lens Cover Category Photography equipment ... more details
Bernard Lens may refer to one of three British artists Bernard Lens 1631 1708 , probably from the Netherlands , also the writer of several religious tracts Bernard Lens II 1659 1725 , son of the former, mezzotint engraver Bernard Lens III 1682 1740 , son of the former, portrait miniature portrait miniaturist Category Artist families Lens Category Portrait miniaturists Lens, Bernard Category British engravers Lens, Bernard ... more details
Unreferenced stub auto yes date December 2009 In optics , a simple lens or singlet lens is a lens optics lens consisting of a single simple element. Typical examples include a magnifying glass or a lens in a pair of simple glasses reading glasses . Simple lenses are prone to chromatic aberration chromatic and other aberration in optical systems aberrations and cannot be used by themselves for precise optical requirements. Some camera s with Focus free lens fixed lenses have however been made using a simple lens, usually a meniscus lens with the convex face facing outward. In such examples the lens aperture is made small and in some cases such as the Kodak Brownie camera Brownie 127 camera , the photographic film film plane is curved to reduce the impact of aberrations. See also Lens optics Aspheric lens DEFAULTSORT Simple Lens Category Photographic lenses Category Lenses Optics stub zh ... more details
The Gauss lens consists of two lens optics lenses in its most basic form, a positive Lens optics Types of simple lenses meniscus lens on the object side and a negative meniscus lens on the image side. The Optical power power of the positive element predominates, but the negative element corrects for chromatic aberration . See also Double Gauss lens Category Lenses optics stub ... more details
Infobox French commune name Lens Lestang region Rh ne Alpes department Dr me d partement Dr me arrondissement Valence canton Le Grand Serre INSEE 26162 postal code 26210 mayor Jean Pierre Olmos term 2001&ndash 2008 intercommunality Rh ne Valloire longitude 5.04333333333 latitude 45.2925 elevation m 300 elevation min m 237 elevation max m 448 area km2 16.41 population 667 population date 1999 Lens Lestang is a Communes of the Dr me department commune in the Dr me Departments of France department in south eastern France . See also Communes of the Dr me department References http www.insee.fr fr methodes nomenclatures cog fichecommunale.asp?codedep 26&codecom 162 INSEE commune file Dr me communes Category Communes of Dr me Lenslestang Dr me geo stub ceb Lens Lestang es Lens Lestang fr Lens Lestang it Lens Lestang ms Lens Lestang nl Lens Lestang pms Lens Lestang pl Lens Lestang pt Lens Lestang bug Lens Lestang uk vi Lens Lestang vo Lens Lestang war Lens Lestang ... more details
additionalcitations date April 2011 A Lens Controller is device that controls motorized photographic lens functions such as Zoom lens zoom , Focus optics focus , and Iris diaphragm iris or aperture. ref Kruegle, Herman 2007 . CCTV Surveillance , Butterworth Heinemann. ref Lens controllers can be found internally in modern still camera photographic lens es and as a stand alone unit in machine vision , remote sensing , optoelectronics systems, and security applications. Internal Photographic Lens Controllers Internal lens controllers take information from the camera or lens elements and perform automatic ... zoom lens and used mainly for photography. Stand Alone Photographic Lens Controllers Stand alone lens controllers are attached to a photographic lens by a cable to allow operator manual control of lens functions. Machine Vision, CCTV, or Computer Vision Lens Controllers Lens controllers for machine ... there is no standard for wiring of lenses most have Direct Current DC motors attached to lens elements and are controlled with 6 VDC, 8 VDC or 12 VDC. Machine vision lens controllers come in manual or computerized varieties. Manual lens controllers are composed of switches and a power supply. When the operator actuates a switch , a function of the lens is enabled. Manual control requires an operator to view the image through the lens in which adjustment is taking place. Manual lens controllers are the most common and are frequently used in CCTV security systems. Computerized lens controllers ... interface. A remote computer sends a command to the lens controller through an RS232 , RS485 , USB , or Ethernet interface to actuate a lens function. The Lens Controller will then perform the command automatically. If a lens is equipped with presets, potentiometers attached to lens ... and move to a specific position. If the lens is not equipped with presets, then the controller can only move a lens function to an approximate position. References See Wikipedia Footnotes on how to create ... more details
Infobox Belgium Municipality name Lens picture Lens Hainaut L tang du moulin.jpg picture legend map Lens Hainaut Belgium Map.png map legend Location of Lens in Hainaut arms flag region BE REG WAL community BE FR province BE PROV HT arrondissement Arrondissement of Mons Mons nis 53046 pyramid date 0 19 20 64 65 foreigners foreigners date mayor Ghislain Moyart PS majority Socialist Party francophone Belgium PS , Reformist Movement MR postal codes 7870 telephone area 065 web http www.lens.be www.lens.be lat deg 50 lat min 33 lon deg 03 lon min 54 Lens is a Wallonia Walloon municipality located in the Belgium Belgian province of Hainaut province Hainaut . On January 1, 2006 Lens had a total population of 3,974. The total area is 49.42 square kilometre km which gives a population density of 80 inhabitants per km . Lens is located along N56 road Belgium N56 road . Hainaut Hainaut geo stub Category Municipalities of Hainaut br Lens Belgia bg ca Lens B lgica de Lens Belgien eo Lens Belgio fr Lens Belgique it Lens Belgio nl Lens Belgi pt Lens B lgica ro Lens Belgia ru simple Lens Belgium vi Lens, Hainaut vo Lens Belg n wa Linse war Lens, Belhika ... more details
In imaging optics, a field lens is a positive powered lens or group of lenses that comes after the objective lens and before the image plane or the eyepiece , serving to change the size of the image, ref http www.colorado.edu physics phys1230 phys1230 fa01 topic43.html Judah Levine, University of Colorado Physics 1230 Light and Color The Field Lens. Fall 2001 ref ref http spie.org x34410.xml SPIE Optopedia Field Lens ref or to provide image space telecentricity . Reference references optics stub Uncategorized date March 2011 ... more details
DISPLAYTITLE Lens genus Taxobox name Lens image Illustration Lens culinaris0.jpg image width 200px image caption Lens culinaris regnum Plantae unranked divisio Angiosperms unranked classis Eudicots unranked ordo Rosids ordo Fabales familia Fabaceae subfamilia Faboideae tribus Fabeae genus Lens genus authority Mill. subdivision ranks Species subdivision Lentil Lens culinaris Lentils br Lens ervoides br Lens lamottei br Lens nigricans br td tr tr td Ref http www.ildis.org ILDIS Version 6.05 The genus Lens of the legume family Fabaceae contains four species of small, erect or climbing herb s with pinnate Leaf leaves and small inconspicuous white flower s and small flattened pods. The edible seed s of Lens species are referred to as lentil s the lentil most commonly eaten is the seed of Lens culinaris . External links http gisweb.ciat.cgiar.org GapAnalysis ?p 271 Crop Wild Relatives Gap Analysis Portal reliable information source on where and what to conserve ex situ , regarding Lens genepool DEFAULTSORT Lens Genus Category Faboideae Faboideae stub az M rcim k cins ca Lens g nere da Linse sl gten de Linsen es Lens planta fr Lens genre hy it Lens botanica ka lt L is augalas ru sv Linssl ktet vi Lens genus ... more details
Image cambo lens board.jpg thumb right 200px Cambo lens board with Copal 1 A Lens board commonly spelled as lensboard is a photographic part used for securing a lens to the front standard of a large format view camera . The lens board itself is usually flat, square, and made of metal most commonly Aluminum or wood and sometimes plastic. The lens board will have a hole of various diameters drilled dead center on the board. A lens board typically varies between 1 and 4 millimeters in thickness. The overall size and shape of the lens board depends on the brand of camera and film format used. Some cameras will use 2 to 4 screws to secure the lens board to the front standard of the view camera, most commonly however, the lens board will be secured by one or more locking levers or tabs to allow tool less removal of the lens board. The rear surface of a lens board is usually painted matte black to keep light entering the camera through the lens during exposure from reflecting off the surface and interfering with the projected image. While most lens boards are flat, some are recessed to accommodate wider focal length lenses which must be positioned closer to the film plane . A recessed lens ... length of a particular lens, a certain diameter of hole must be drilled in the center of the lens board to accommodate the shutter photography shutter assembly . Lens boards are typically available pre drilled by the camera manufacturer, however, if no replacement lens board is available from a camera ... 1 41.6 mm Copal 3 65 mm Copal 3s 64.5 mm Lens mounting Image graphex lens board.jpg thumb right 200px 135mm Optar lens mounted on a 0 Speed Graphic lens board Lenses are fitted to a lens ... photography shutter assembly by threading a locknut to rear of the shutter. A front lens element will thread onto the mounted shutter and if necessary, a second lens element will thread onto the rear ... with the appropriate tools. Other uses Image enlarger lens board.jpg thumb right 200px Enlarging lens ... more details
Unreferenced stub auto yes date December 2009 Lens sag is a problem that sometimes afflicts very large refracting telescope s. It is the equivalent of mirror sag in reflecting telescope s. It occurs when the physical weight of the glass causes a distortion in the shape of the lens optics lens because the lens can only be supported by the edges. A mirror on the other hand can be effectively supported by the entire opposite face, making mirror sag much less of a problem. One expensive solution to lens sag is to place the telescope in orbit around the Earth . DEFAULTSORT Lens Sag Category Telescopes Optics stub ... more details
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