Image Pentacon electric f2,8 29mm MC lens.jpg thumb right A 29mm primelens 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 primelens 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 primelens 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 ... ref A primelens of a given focal length is less versatile than a zoom whose range includes that focal ... with a zoom lens, a primelens has fewer moving parts which are optimized for one particular ... of field . A normal lens or normal prime is a lens with a focal length about equal to the diagonal ... and apparently somewhat older meaning of the term primelens is the main lens in a combination lens ... year 1967 edition v.115 url http books.google.com books?id ZIAqAAAAMAAJ&q primelens date 0 1950&dq primelens date 0 1950&pgis 1 ref When the camera lens is used with some other optical device, such as a close ... called the primelens . Prime is here used in the sense of primary, chief, original, first in order .... This use of the term primelens is an example of a retronym . Early in photography only primary ... were available, which usually fit in front of the front element of the primary, or primelens. Popular Focal Lengths Many lens manufacturers produce or produced prime lenses at or near the following ... Prime lenses and zooms compared with photographs to illustrate DEFAULTSORT PrimeLens Category Photographic ... tetap it Obiettivo a lunghezza focale fissa pl Obiektyw sta oogniskowy simple Primelens fi Kiinte polttov linen ... 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 Camera lens , a lens designed for use on a camera Focusing of other radiation and forces Gravitational lens , a massive astronomical object which causes visual distortions 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 Kamera lens biology , a unicellular, flagellate organism and the only species of the genus Kamera. 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 Jeremain Lens , Dutch Surinam footballer 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 an Lens de Lens es Lens eo Lens fr Lens it Lens lb Lens lt Lens nl Lens oc Lens pms Lens pt Lens sco Lens simple Lens disambiguation sk Lens sv Lens tr Lens vo Lens ... more details
Infobox single See Wikipedia WikiProject Songs Name Into the Lens Cover Into the Lens.jpg Artist Yes band Yes Album Drama Yes album Drama B side Does It Really Happen? Released 1980 Format 7 Recorded Genre Progressive rock Length 3 47 Label Atlantic Records Atlantic Writer Geoff Downes , Trevor Horn , Steve Howe guitarist Steve Howe , Chris Squire , Alan White Yes drummer Alan White Producer Yes and Eddie Offord Chronology Last single Don t Kill The Whale br 1978 This single Into the Lens br 1980 Next single Owner of a Lonely Heart br 1983 Into the Lens is a song originally written by Trevor Horn and Geoff Downes of The Buggles . It was first released as Into the Lens on the Yes band Yes album Drama Yes album Drama in 1980, and the year after on Adventures in Modern Recording , the second and last album of The Buggles. Both versions were also released as singles Into the Lens I Am a Camera by Yes in 1980 and I Am a Camera in October 1981 by The Buggles on Carrere Records . ref name AIMR I Am a Camera Infobox single Name I Am a Camera Type Single Artist The Buggles from Album Adventures in Modern Recording Cover I Am A Camera Single Cover.jpg B side Fade Away Released October 1981 Format 7 , 12 Genre Synthpop Length 4 32 Label Carrere Records Carrere br ZTT Records ZTT Writer Geoff Downes , Trevor Horn Producer Trevor Horn Last single Elstree song Elstree br 1980 This single I Am ... , and therefore, Into the Lens features a more distinctive progressive Rock prog rock sound. When ... track and we had adapted it into a Yes track. It became Into the Lens and, naturally, slightly more overblown. I don t mind Into the Lens the melody s unadulterated while the arrangement s a lot ... I will never let you go, and you always let the feelings show Into the Lens compared to I will never ... in music 2010 re release of Adventures in Modern Recording . The single edit of Yes own Into the Lens was entitled Into the Lens I Am a Camera . The line I am a camera is a quote from Christopher ... more details
Infobox animanga Header name A, A Prime image File A,A Prime Cover.jpg 230px caption Cover of A, A Prime as published by Viz Media ja kanji ja romaji genre Science Fiction Infobox animanga Print type manga author Moto Hagio publisher Akita Shoten former br Shogakukan current publisher en flagicon United States Viz Media demographic Sh jo manga Sh jo magazine Princess magazine Princess magazine en flagicon United States Manga Vizion published August 1981 first last volumes volume list Infobox animanga Footer A, A Prime is a short science fiction manga by Moto Hagio . It was first serialized in August 1981 in Princess magazine Princess . It is published left to right in English by VIZ Media and translated by Matt Thorn . In this publication there are also two others stories by Hagio, 4 4 Quatre Quarts and X Y , included. X Y , which was serialized in manga magazine Petit Flower between July and August 1984, won the Seiun Award in 1985 ref http www.sf fan.gr.jp awards list.html List of Seiun Awards Winners ref References reflist External links ann manga 1874 http robvollmar.blogspot.com 2006 07 review of moto hagios a prime.html Rob Vollmar s review published in The Comics Journal issue 269, pages 134 136 http www.popcultureshock.com manga index.php features classics corner classics corner a a Pop Culture Shock review use archived review link http www.webcitation.org 5qyVnKgEO Category Science fiction anime and manga Category Viz Media manga Category 1981 manga Category Sh jo manga manga stub tl A, A Prime ... more details
Primary lens redirects here. See also primelens . 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 ... 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 ... 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
File PentaxK7 7.jpg thumb A digital SLR camera with a pancake lens. A pancake lens is colloquial term for a flat, thin lens short barrel , generally a normal or slightly wide primelens for a camera. There are pancake lenses for two kinds of cameras Compact System Camera CSC and single lens reflex SLR . Motivation Pancake lenses are primarily valued for providing quality optics in a compact package. The resulting camera and lens assembly may even be small enough to be pocketable, a design feature which is usually impractical with conventional SLR bodies and lens assembiles. DpReview review of Olympus E P1, for instance, History An early example is the Zeiss Tessar of 1902. The design has seen a resurgence due to the growth of the mirrorless interchangeable lens digital camera so called EVIL camera market, notably the Micro Four Thirds system . In the 1960s and 1970s the Nikon GN lens was a notable example, while in the 1970s and 1980s pancake lenses were used in compact single lens reflex SLR cameras. ref Digital Photography Review DPReview forum http forums.dpreview.com forums read.asp?forum 1000&message 20033770 Re Why is a pancake lens a big deal? , Photomonkey, 10 01 14 PM, Thursday, September 14, 2006 ref ref http mydigitalcamera.us pancake lenses pancake lenses ref Gallery File SMC Pentax M 40mm pancake.jpg SMC Pentax M 40mm File Pentax DA 21mm F3.2 AL Limited.jpg Pentax DA 21mm f3.2 Gallery See also Pentax K mount Micro Four Thirds system Micro Four Thirds lenses Micro Four Thirds Lenses Samsung NX mount NX lenses Samsung NX Lenses Sony E mount Available lenses Sony E mount Lenses Nikon 1 References reflist Category Photographic lens designs ... more details
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 telephoto lens telephoto for added versatility. Primelens es are generally faster smaller f number , but the change to zoom lenses has usually meant that a slower higher f number lens is used. This is because in most cases prime lenses ...A kit lens is a starter photographic lenslens which can be sold with an interchangeable lens camera such as a single lens reflex camera . It is generally an inexpensive lens priced at the lowest end of the manufacturer ... body, the lens, and various accessories usually necessary to get started in SLR photography. A kit lens can be sold by itself outside of a kit, particularly the ones that are moderately expensive for instance a kit lens included in a prosumer SLR kit is often marketed as an upgrade lens for a consumer SLR. In addition, retailers often have promotions of standalone low end SLR bodies without the lens ... zoom lens is to maintain a low entry price and maximize usability for the beginner photographer. Higher end SLRs generally do not come 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 ... EOS 400D 400D Canon EF S 18 55mm IS lens Replaced the original 18 55mm on all consumer level cameras starting from the Canon EOS 450D 450D and later Canon EF S 17 85mm lens Canon EOS 20D , Canon EOS 30D , Canon EOS 40D 40D , optional 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 135mm lens Canon EOS 50D 50D , optional on Canon EOS 7D 7D Canon EF 28 105mm lens Alternative lens Canon EF 28 80mm lens Kit lens for film body Canon Canon ... more details
FFL lens see primelens . They are commonly used with still camera still , video camera video , motion ... imaging quality on par with primelens es. Constant fast aperture zooms usually f 2.8 or f 2.0 are typically ... By focal length Primelens Superzoom Telephoto lens Wide angle lens Focus attributes Parfocal 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 ... 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 ... focus lens es, with focal lengths longer than a normal lens , some are wide angle lens es wider ... focal length lens as the popular one lens selection on many contemporary cameras. The markings ... focal length supplied by the negative diverging lens is longer than the overall lens assembly the negative diverging lens acting as the telephoto group . ref http books.google.com books?id LbdefSMHICkC&pg PA521&dq zoom lens negative become telephoto&hl en&ei 2EAKToW7CaTg0QHPpdmeAQ&sa X&oi book ... the effect of a longer focal length zoom lens narrower angle of view . This is commonly known as digital ... of a zoom lens can be used as a optical telescope telescope of variable magnification to make an adjustable ... of the Royal Society in 1834. Early 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 lenses , since when the focal length is changed, the position of the focal ... more details
Photochromic lens Photographic lensPrimelens Prism optics Ray tracing physics Ray tracing Sunglass ...Other uses Lens disambiguation Lens No, this dablink is not superfluous. Some of the listed other uses of lens are ambiguous with lens optics . File BiconvexLens.jpg thumb right 250px A lens. File Lens and wavefronts.gif right frame Lenses can be used to focus light. A lens is an optics optical device ... , converging or diverging the light beam beam . Citation needed date September 2010 A simple lens consists of a single optical element. A compound lens is an array of simple lenses elements with a common ... lenses for instance, a microwave lens can be made from paraffin wax . The variant spelling lense ... lens File Nimrud lens British Museum.jpg thumb right The Nimrud lens The word lens comes from the Latin name of the lentil , because a double convex lens is lentil shaped. The genus of the lentil plant is Lens genus Lens , and the most commonly eaten species is Lens culinaris . The lentil plant also gives its name to a Lens geometry geometric figure . The oldest lens artifact is the Nimrud lens , which is over three thousand years old, dating back to ancient Assyria . ref name Nimrud lens Cite ... sunlight. ref name Nimrud lens ref Cite journal journal Die Fortschritte der Physik publisher Deutsche ... lens and decomposed glass found in Niniveh language German url http books.google.com ?id bHwEAAAAYAAJ&pg RA1 PA355&dq niniveh lens ref Assyrian craftsmen made intricate engravings, and could have used such a lens in their work. Another early reference to magnification dates back to ancient Egypt ian ... play The Clouds 424 BC mentioning a burning glass a Types of lenses biconvex lens used to focus ... is arguably the earliest written reference to a corrective lens Nero was said to watch the gladiator ... comparable to that of 1950s aspheric lens es. The Viking lenses were capable of concentrating ..., these were primitive Lens optics Types of simple lenses plano convex lenses initially made by cutting ... 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
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 primelens es manufactured by Krasnogorskiy Zavod KMZ 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 telephoto lens 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 ... 11.html Tair 11 page DEFAULTSORT Tair Lens Category Photographic lenses photo stub ... 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 ... 2004 Media Publishing ref lens speed is a key variable in combination with other variables such as focal ... 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, primelensprime fixed focal length lenses are generally faster than zoom lens es, and modern manual focus lenses are generally faster than their autofocus ... 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 care ... inexpensive, particularly in normal lens focal lengths. For example, the Canon EF 50mm f ... more details
Infobox French commune name Lens Lestang region Rh ne Alpes department Dr me arrondissement Valence canton Le Grand Serre INSEE 26162 postal code 26210 mayor Jean Pierre Olmos term 2008&ndash 2014 intercommunality Rh ne Valloire longitude 5.0433 latitude 45.2925 elevation m 300 elevation min m 237 elevation max m 448 area km2 16.41 population 801 population date 2008 Lens Lestang is a Communes of France commune in the Dr me Departments of France department in southeastern France . Population D mographie 1911 976 1962 609 1968 655 1975 636 1982 672 1990 629 1999 667 2008 801 See also Communes of the Dr me department References http www.insee.fr en home home page.asp INSEE reflist commonscat Dr me communes DEFAULTSORT Lenslestang Category Communes of Dr me Dr me geo stub ca Lens Lestang ceb Lens Lestang de Lens Lestang es Lens Lestang eu Lens Lestang fr Lens Lestang it Lens Lestang mg Lens Lestang ms Lens Lestang nl Lens Lestang oc Lens Lestang pms Lens Lestang pl Lens Lestang pt Lens Lestang sk Lens Lestang sv Lens Lestang bug Lens Lestang uk vi Lens Lestang vo Lens Lestang war Lens Lestang ... more details
set so that the angle of incidence and the angle of refraction are equal. In a primelens this is easy ... lenses, including wide angle, telephoto and speciality A camera lens also known as photographic lens or photographic objective is an optics optical lens optics lens or assembly of lenses used in conjunction ... media capable of storing an image chemically 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 .... There is no major difference in principle between a lens used for a still camera , a video camera .... A lens may be permanently fixed to a camera, or it may be interchangeable lens camera interchangeable ... 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 most rays of light ... can be thought of as an answer to the question how can we modify a pinhole lens to admit more light and give higher resolution? A first step is to put a simple convex lens at the pinhole ... lens bends light in proportion to its angle of incidence on the lens. The geometry is almost the same as with a simple pinhole lens, but rather than being illuminated by single rays of light, each ... the world is known as the lens s entrance pupil ideally, all rays of light leaving a point on the object ... the object point is in the field of view . If one were inside the camera, one would see the lens acting as a Image projector projector . The virtual image of the aperture from inside the camera is the lens ... pinhole with lens.svg With a simple lens, much more light can be brought into sharp focus. gallery Practical photographic lenses include more lens elements. The additional elements allow lens designers ... more details
was opened to the public in Lens. See also Louvre Mus e du Louvre Palais du Louvre Louvre Abu Dhabi ... 31569 Art On The March The Louvre Lens and The Pompidou Metz.html Images and profile at Specifier Magazine Louvre Category Lens Category Mus e du Louvre Category Art museums and galleries in France ... in 2012 fr Louvre Lens ... 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 aberration in optical systems aberrations , especially chromatic aberration . They cannot be used for precise imaging and make poor camera lens es. They are commonly used for laser applications, however, where the beams are both monochromatic minimizing chromatic aberration and narrow minimizing spherical aberration . Some camera s with Focus free lens fixed lenses have 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 Doublet lens Aspheric lens DEFAULTSORT Simple Lens Category Photographic lenses Category Lenses Optics stub zh ... 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
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
Refimprove date June 2011 File Lens flare scheme en.svg thumb 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. File Tulip Lens Hood.jpg thumb A conical petal 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 . ref van Walree, Paul Lens hoods, http toothwalker.org optics lenshood.html ref The geometry of the lens hood can vary from a plain cylindrical or conical section much like a lamp shade to a more ... without blocking the field of view of the lens and thus producing vignetting . Properly petal shaped lens hoods produce more shade than normal lens hoods with the same end diameter. Square lens hoods may be even better. Citation needed date April 2012 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. ref Harmer, Jim, http improvephotography.com 1101 lens hood purpose dslr What does a lens hood do? , Improve Photography , 15 Jun 2011 ref gallery File Canon EF 70 200mm F2.8L lens with hood.jpg A conical petal 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 ... more details
of Media Lens receive the Gandhi Foundation Peace Award, 2007 Media Lens is a United Kingdom British ... The Guardian and The Independent , labels Media Lens frequently disputes. Jonathan Cook , a sympathetic ... Lens, 30 June 2011 http www.medialens.org index.php?option com content&view article&id 584 a comparative ... Review of Flat Earth News nowiki nowiki by Nick Davies nowiki nowiki and nowiki nowiki Media Lens nowiki nowiki Newspeak , Media Lens, 20 November 2009 and http www.medialens.org index.php?option com ... Media Alert Tilting Towards Israel , Media Lens, 4 January 2011 ref The editors invite their readers ... The goal of Media Lens is to promote rationality, compassion and respect for others. If you do write ..., Libya, Oil , Media Lens, 22 June 2011 ref Media Lens is admired by some prominent journalists ... , then with The Times , received vexatious and threatening emails from visitors to Media Lens ref name ... en 2011 05 479234.html Interview with David Edwards from Media Lens , UK Indymedia, 10 May 2011.Interview also reproduced at http nowthenmagazine.com issue 38 media lens Interview with David Edwards ... com content&task view&id 145&Itemid 72 Interview with David Edwards and David Cromwell of Media Lens .... ref Judith Townend http www.journalism.co.uk news features q amp a media lens our book will likely be more or less ignored as other similar books have been s5 a536740 Q&A Media Lens Our book will likely ... 2009 ref The editors of Media Lens assert that the corporate media is the source of some of the greatest ... blog books 2011 01 12 rax interview media lens Rax Interview with Media Lens , New Internationalist blog, 12 January 2011 ref Central to Media Lens analyses is the Propaganda model identified with Edward ... commended Media Lens, who have performed a major public service by carrying out this task with energy ... web author Omar Hayat url http gandhifoundation.org 2007 12 02 2007 peace award media lens title Gandhi ...? Media Lens, 27 September 2010 ref A former supporter though, the philosopher Rupert Read , has criticised ... 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
Image MC Mir 47M.jpg thumb right MC Mir 47M 2,5 20mm Image MIR 1W 2,8 37mm.jpg thumb Mir 1W 2,8 37mm Mir lang ru is a Soviet wide angle prime lens series with focal length s varying from 20 to 37 mm with 5 7 elements. The first variant was the Mir 1 and won the Grand Prix at Expo 58 in Brussels . Its construction was derived from the Flektogon lens by Carl Zeiss . The first element in this lens is in fact a disperser meniscus to reduce vignetting vignette effects when photographing with an open diaphragm optics diaphragm . External links http v3.espacenet.com origdoc?DB EPODOC&IDX US2793565&F 0&QPN US2793565 Flektogon Russian sources D.S. Volosov, Photographic optics theory, design basics, optical characteristics , 2nd revised edition, Moscow, Iskusstvo Publishing House, 1978. ru icon http www.zenitcamera.com archive lenses mir 1.html Mir 1 , http www.zenitcamera.com archive lenses mir 1.html Mir 1 , http www.zenitcamera.com archive lenses mir 5.html Mir 5 , http www.zenitcamera.com archive lenses mir 6.html Mir 6 , http www.zenitcamera.com archive lenses mir 10.html Mir 10 , http www.zenitcamera.com archive lenses mir 20.html Mir 20 , http www.zenitcamera.com archive lenses mir 24.html Mir 24 , http www.zenitcamera.com archive lenses mir 46.html Mir 46 , http www.zenitcamera.com archive lenses mir 47.html Mir 47 , http www.zenitcamera.com archive lenses mir 47.html Mir 47 , http www.zenitcamera.com archive lenses mir 51.html Mir 51 optics stub Category Soviet photographic lenses ru ... 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 ar az M rcim k cins ca Lens g nere da Linse sl gten de Linsen dsb Sok rod es Lens planta fr Lens genre hy hsb Sok r d it Lens botanica ka lt L is augalas nl Lens geslacht ru sv Linssl ktet vi Lens chi ... 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 . References Reflist optics stub Category Lenses Category Microscope components de Feldlinse ... more details
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