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 . In 2007 its population was 4042. ref http statbel.fgov.be downloads pop200701com.xls Werkelijke bevolking per gemeente op 1 januari 2007 Population de droit par commune au 1 janvier 2007 .xls ref The total area is 49.42 km which gives a population density of 80 inhabitants per km . It is located at 50 33 North, 03 54 East, alongside the N56 road Belgium N56 road . ref http statbel.fgov.be pub d1 p120 nl.xls Geografische co rdinaten van de gemeenten .xls ref References Reflist Hainaut Hainaut geo stub Category Municipalities of Hainaut province br Lens Belgia bg ca Lens B lgica de Lens Belgien eo Lens Belgio fa fr Lens Belgique it Lens Belgio nl Lens Belgi pt Lens B lgica ro Lens Belgia ru simple Lens Belgium sk Lens Belgicko vi Lens, Hainaut vo Lens Belg n wa Linse war Lens, Belhika ... 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
Image Cylindrical lenses.jpg thumb Cylindrical lenses. Image CylindricalLenses 2.png thumb 300px Diagram showing cylindrical lenses. br A Plano Convex cylindrical lens br B Plano Concave cylindrical lens A cylindrical lens is a lens optics lens which Focus optics focus es light which passes through on to a line instead of on to a point, as a Lens optics spherical lens would. The curved face or faces of a cylindrical lens are sections of a Cylinder geometry cylinder , and focus the image passing through it onto a line parallel to the intersection of the surface of the lens and a plane tangent to it. The lens compresses the image in the direction perpendicular to this line, and leaves it unaltered in the direction parallel to it in the tangent plane . Cylindrical lenses can be used to correct astigmatism eye ocular astigmatism , although toric lens es are more commonly used. They can also potentially be used in solar water heating installations, such as a plastic pillow type solar water heater. They are used to correct the output from diode laser s, to produce a round beam from the diode s elliptical output. Sources Jacobs, Donald H. Fundamentals of Optical Engineering. McGraw Hill Book Co., 1943. Category Lenses optics stub de Zylinderlinse es Lente cil ndrica nl Cilindrische lens ... more details
Image Imgageinverting 1.png thumb right Cross section of relay lens assembly System 1. Image Imageinverting 2.png thumb right Cross section of relay lens assembly System 2. Image Image erecting system.png thumb right Image erecting optical system for astronomical telescopes Erecting eyepiece . In optics, a relay lens is a lens or lens group that inverts an image and extends the optical tube. Relay lenses are found in endoscope s and periscope s for the purpose of extending the system, and before eyepiece s for the purpose of inverting an image. They may be made of one or more conventional lenses or achromatic doublet s, or a long cylindrical GRIN gradient index of refraction lens a GRIN lens . Relay lenses operate by producing intermediate planes of focus. For example, an objective lens such as an SLR lens produces an image plane where the image sensor would usually go. If you place a lens with focal length f a distance 2 f from that image plane and then put an image sensor 2 f beyond the lens, that lens will relay the first image to the second with 1 1 magnification see Lens optics Imaging properties Lens imaging properties . Ideally, this second image plane will be identical to the first, so you could put a sensor there and record exactly the same image. If a longer distance is needed, this can be repeated. In practice, the lens will be an achromatic doublet . Also, for endoscope applications, where small tube diameter is desirable, most of the tube is filled with glass, with thin air gaps to allow for powered surfaces because marginal ray angle is smaller at a given numerical aperture the higher the index of refraction , this allows the relay to have higher NA for a given diameter. These are known as Hopkins rod lenses . External links Lens erecting systems. http www.tpub.com content misc manuals 2 TM 9 258 TM 9 2580106.htm Image erecting systems http i916.photobucket.com ... EBchecked topic 496947 relay lens Category Lenses Optics stub ... more details
Unreferenced stub auto yes date December 2009 In geology a lens is a body of ore or Rock geology rock or a deposit that is thick in the middle and thin at the edges, resembling a convex lens in cross section. Adjective lenticular . A lens can also refer to an irregular shaped formation consisting of a porous , Permeability fluid permeable sedimentary deposit surrounded by impermeable rock. DEFAULTSORT Lens Geology Category Petrology Category Sedimentology Geology stub it Lente geologia pt Lente geologia uk ... more details
Unreferenced date December 2009 Infobox Anatomy Name Capsule of lens Latin capsula lentis GraySubject 226 GrayPage 1019 Image Gray883.png Caption The upper half of a sagittal section through the front of the Human eye eyeball . Capsule of lens labeled at center right. Image2 Caption2 System Precursor MeshName MeshNumber DorlandsPre DorlandsSuf The lens capsule is a component of the Human eye eye . It is a clear, membrane like structure that is quite elastic, a quality that keeps it under constant tension. As a result, the lens naturally tends towards a rounder or more globular configuration, a shape it must assume for the eye to Focus optics focus at a near distance. See also Lens anatomy Eye anatomy DEFAULTSORT Capsule Of Lens Category Eye anatomy Eye stub ja ... more details
Breathing refers to when a lens optics lens optics change the apparent focal length slightly when shifting the mechanical focus optics focus . Some often higher quality lenses are designed to lessen the degree this effect. Lens breathing does not prevent one from racking focus or follow focus following focus with this lens, but it lessens the desirability of any type of focus adjustment, since it noticeably changes the composition of the shot. Not to be confused with the suction and expulsion of air from within the lens as its internal volume changes. DEFAULTSORT Breathing Lens Category Film and video terminology Filming stub ... more details
Unreferenced date February 2007 A triplet lens is an optics optical device consisting of three single Lens optics lenses . The triplet design is the simplest to give the required number of Degrees of freedom physics and chemistry degrees of freedom to allow the lens designer to overcome all Seidel aberration s. File Lens triplet.svg right thumb A Lens triplet Triplet lens . The term is used in two ways. The three lenses may be cemented together, as in the Steinheil triplet . Or a triplet may be designed with three spaced glasses, e.g. the Cooke triplet . Category Lenses optics stub ... more details
Infobox Anatomy Name Crystalline lens anatomy Latin lens crystallina GraySubject 226 GrayPage 1019 Image ... point of a near object being brought to a focus by changing the curvature of the lens. Image2 Schematic ... Artery Vein Nerve Lymph MeshName Crystalline lens MeshNumber DorlandsPre l 06 DorlandsSuf 12483326 The crystalline lens is a transparent, Lens optics Types of simple lenses biconvex structure in the eye that, along with the cornea , helps to refract light to be Focus optics focused on the retina . The lens ... on the retina. This adjustment of the lens is known as Accommodation eye accommodation see also ... lens lenses . The lens is flatter on its anterior side. The lens is also known as the aquula Latin, a little stream , dim. of aqua , water or crystalline lens . In humans, the refractive power of the lens in its natural environment is approximately 18 dioptre s, roughly one third of the eye s total power. Position, size, and shape The lens is part of the anterior segment of the eye. Anterior to the lens is the iris anatomy iris , which regulates the amount of light entering into the eye. The lens is suspended in place by the Zonule of Zinn suspensory ligament of the lens , a ring of fibrous tissue that attaches to the lens at its equator ref http www.biology online.org dictionary Equator of lens ref ref http medical dictionary.thefreedictionary.com equator of the crystalline lens ref and connects it to the ciliary body . Posterior to the lens is the vitreous body , which, along with the aqueous humor on the anterior surface, bathes the lens. The lens has an ellipsoid, biconvex shape. The anterior surface is less curved than the posterior. In the adult, the lens is typically ... that the size and shape can change due to accommodation and because the lens continues to grow ... 1790 6 ref Variations among vertebrates In many aquatic vertebrates, the lens is considerably thicker ... 677 . Boston McGraw Hill ref Even among terrestrial animals, however, the lens of primate s such as humans ... more details
Unreferenced stub auto yes date December 2009 Lens sag is a problem that sometimes afflicts very large refracting telescope Technical considerations 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 . The technical limit concerning lens sag was reached at the Yerkes refractor 1897 with an aperture of 40 102 cm , where the sagging already causes small optical distortions. The 1890s therefore mark the end of the great refractor s era. DEFAULTSORT Lens Sag Category Telescopes Optics stub de Linsendurchbiegung ... more details
Infobox Embryology Name Lens placode Latin placoda lentis GraySubject GrayPage Image Gray864.png Caption Transverse section of head of chick embryo of fifty two hours incubation. Image2 Caption2 System CarnegieStage Days Precursor surface ectoderm GivesRiseTo Lens anatomy lens MeshName MeshNumber Code Terminologia Embryologica TE E5.16.3.1.0.0.13 The Lens placode is a thickened portion of ectoderm which serves as the precursor to the Lens anatomy lens . SOX2 and Pou2f1 are involved in its development. ref name pmid17140559 cite journal author Donner AL, Episkopou V, Maas RL title Sox2 and Pou2f1 interact to control lens and olfactory placode development journal Dev. Biol. volume 303 issue 2 pages 784 99 year 2007 pmid 17140559 doi 10.1016 j.ydbio.2006.10.047 ref See also placode References references External links EmbryologyUNC eye 008 http cwx.prenhall.com bookbind pubbooks martini10 chapter18 custom3 deluxe content.html http isc.temple.edu neuroanatomy lab embryo new eye 2 Gray s Development of eye and ear Category Embryology of nervous system Category Eye Anatomy stub ... more details
Italic title Taxobox name Mitra lens image image caption regnum Animal ia phylum Mollusca classis Gastropoda unranked superfamilia clade Caenogastropoda br clade Hypsogastropoda br clade Neogastropoda superfamilia Muricoidea familia Mitridae subfamilia genus Mitra gastropod subgenus Nebularia species M. lens binomial Mitra lens binomial authority Wood, 1828 synonyms ref synonyms Mitra lens is a species of sea snail , a marine gastropod mollusk in the family biology family Mitridae , the miters or miter snails. ref name WoRMS WRMS species 416862 Mitra lens Wood, 1828 04 24 10 ref Description Empty section date April 2010 Distribution Empty section date April 2010 References reflist External links DEFAULTSORT Mitra Lens Category Mitridae Mitridae stub vi Mitra lens ... more details
Unreferenced date October 2006 Image Panotools5618.jpg thumb 250px curvilinear perspective Curvilinear above and rectilinear below image. Notice the barrel distortion typical for fisheye lens es in the curvilinear image. While this example has been rectilinear corrected by software, high quality wide angle lens es are built with optical rectilinear correction. In photography , a rectilinear lens is a photographic lens that yields images where straight features, such as the walls of buildings, appear with straight lines, as opposed to being curved. In other words, it is a lens with little or no barrel or pincushion Image distortion distortion . At particularly wide angles, however, the rectilinear perspective will cause objects to appear increasingly stretched and enlarged as they near the edge of the frame. These types of lenses are often used to create forced perspective effects. The vast majority of video and still cameras use lenses that produce nearly rectilinear images. A popular alternative type of lens is a fisheye lens which produces a distinctly curvilinear, wide angle lens wide angled result. See also Rectilinear grid Rapid Rectilinear Gnomonic projection Nikkor 13mm f 5.6 DEFAULTSORT Rectilinear Lens Category Photographic lenses pt Objetiva retil nea Photo stub ... more details
about varifocal camera lenses corrective eyeglass lenses Progressive lens A varifocal lens is a camera lens with variable focal length in which Focus optics focus changes as focal length and magnification changes, as compared to parfocal lens parfocal true zoom lens , which remains in focus as the lens zooms focal length and magnification change . Many so called zoom lenses, particularly in the case of fixed lens cameras, are actually varifocal lenses . ref cite web url http www.rogercavanagh.com helpinfo 30 parfocal.stm title Parfocal Lenses accessdate 2007 11 18 last Cavanagh first Roger date 2003 05 29 archiveurl http web.archive.org web 20071007070643 http www.rogercavanagh.com helpinfo 30 parfocal.stm Bot retrieved archive archivedate 2007 10 07 ref Image Varifocal example.jpg thumb 500px none A varifocal lens. Left image is at 2.8mm, in focus. Middle image is at 12mm with the focus left alone from 2.8mm. Right image is at 12mm refocused. The close knob is focal length and the far knob is focus. References Footnotes reflist Notations cite web url http www.tokina usa.com glossary.html title Lens Glossary accessdate 2007 11 18 work Tokina Industrial, Inc. optics stub Category Photographic lenses es Varifocal ja pt Lente varifocal ... more details
Unreferenced stub auto yes date December 2009 Orphan date December 2009 The coverage of a lens optics lens is the size of the image it can produce, measured as the diameter of the image circle produced by the optics. In a camera system the coverage must be large enough to cover the sensor or film used. In a view camera system, because the photographic film film plane can be moved independently of the lens plane, the lens must have enough coverage to cover the film while it is offset from the center of the coverage area. Inadequate coverage can lead to vignetting . DEFAULTSORT Coverage Lens Category Science of photography Photo stub ... more details
Orphan date February 2009 Unreferenced date November 2006 The Hektor is a photographic lens design manufactured by Leica Camera . The first lens speed fast lens available for the Leica I A was the Hektor 50mm f 2,5. Later, the design was adapted for use as a long portrait lens, available first in a 135mm F number f 4,5 screw mount version and later in a 125mm f 2,5 bayonet mount version. It is reported that Max Berek , who designed the original lens line for Leitz , named the Hektor after his dog. Fact date February 2007 Lenses named Hektor have also been used by Leitz as projection lenses for their Prado line of slide projectors, e.g. the Hektor 2.5 85 or the Hektor 2.5 100. Category Photographic lenses ... more details
Unreferenced auto yes date December 2009 A lens lantern is a small, self contained lamp structure which may sometimes be used to serve as a lighthouse . Unlike a regular Fresnel lens , the lantern requires no housing to protect it from the weather its glass sides would refraction refract and magnify the light in the same fashion as would the lens. Lens lanterns were popular alternatives to lighthouses in the nineteenth century they required less care, were cheaper to erect, and could be fairly easily placed. See also F. Ross Holland, Jr. America s Lighthouses Their Illustrated History Since 1716 . DEFAULTSORT Lens Lantern Category Lighthouses Pharology stub ... more details
name5 Lens, Pas de Calais Lens area footnotes area total km2 278 population total 326,719 population ..., ponds, and glaciers larger than 1 km as well as the estuaries of rivers. The arrondissement of Lens ... of Lens are Canton of Avion Avion Canton of Bully les Mines Bully les Mines Canton of Carvin ... Beaumont Canton of Leforest Leforest Canton of Lens Est Lens Est Canton of Lens Nord Est Lens Nord Est Canton of Lens Nord Ouest Lens Nord Ouest Canton of Li vin Nord Li vin Nord Canton of Li vin Sud Li vin Sud Canton of Montigny en Gohelle Montigny en Gohelle Canton of Noyelles sous Lens Noyelles sous Lens Canton of Rouvroy Rouvroy Canton of Sains en Gohelle Sains en Gohelle Canton of Wingles Wingles Communes The communes of the arrondissement of Lens, and their INSEE code s, are class wikitable ... small 9. Carvin small 62215 small 10. Courcelles l s Lens small 62249 small 11. Courri res small 62250 ... small 17. Fouqui res l s Lens small 62351 small 18. Gouy Servins small 62380 small 19. Grenay, Pas ... 25. Lens, Pas de Calais Lens small 62498 small 26. Libercourt small 62907 small 27. Li vin small 62510 small 28. Loison sous Lens small 62523 small 29. Loos en Gohelle small 62528 small 30. Mazingarbe ... sous Lens small 62628 small 36. Oignies small 62637 small 37. Pont Vendin small 62666 small 38. Rouvroy ... ARROND&code 627&nom Pas de Calais&tnccnom 1&numreg 31&numdep 62&numar 7&numct Lens on French National ... Category Arrondissements of Pas de Calais Lens an Destrito de Lens br Arondisamant Lens ca Districte de Lens cs Arrondissement Lens de Arrondissement Lens es Distrito de Lens fr Arrondissement de Lens it Arrondissement di Lens lb Arrondissement Lens nl Arrondissement Lens pl Okr g Lens ru vi Lens huy n ... more details
A lens clock is a mechanical dial indicator that is used to measure dioptric power of a lens optics lens . It is a specialized version of a spherometer . A lens clock measures the curvature of a surface, but gives the result as an optical power in diopter s, assuming the lens is made of a material with a particular refractive index . How it works The lens clock has three pointed probes that make contact with the surface of the lens. The outer two probes are fixed while the center one moves, retracting as the instrument is pressed down on the lens s surface. As the probe retracts, the hand on the face .... A typical lens clock is calibrated to display the power of a Crown glass optics crown glass surface, with a refractive index of 1.523. If the lens is made of some other material, the reading must be adjusted to correct for the difference in refractive index. Measuring both sides of the lens and adding the surface powers together gives the approximate optical power of the whole lens. This approximation relies on the assumption that the lens is relatively thin lens thin . Radius of curvature ... power given by the lens clock using the formula math R n 1 over phi , math where math n math is the index of refraction for which the lens clock is calibrated , regardless of the actual index of the lens being measured. If the lens is made of glass with some other index math n 2 math , the true ... for refractive index A biconcave lens made of flint glass with an index of 1.7 is measured with a lens clock calibrated for crown glass with an index of 1.523. If the lens clock gives surface powers of 3.0 and 7.0 diopters dpt , the optical power of the lens is obtained as follows First, the radii ... mathrm dpt math Finally, if the lens is thin the powers of each surface can be added to give the approximate optical power of the whole lens 13.4 diopters. The actual power, as read by a vertometer or lensometer , might differ by as much as 0.1 diopters. The optical power of the lens is not merely ... more details
File Toric lens surface 2.png thumb right Toric lens surface as cap top right from a torus here with R 1.2 r . A toric lens is a lens optics lens with two different optical power powers in two orientations perpendicular to each other. One of the lens surfaces is shaped like a cap from a torus see figure at right , while the other one usually is Sphere spherical . Toric lenses are primarily used in Glasses eyeglass es, contact lens es and intraocular lens es, to correct for Astigmatism eye astigmatism . Torus File Superficie t rica.svg thumb right upright A torus results when a circle with radius r rotates around an axis lying in the same plane as the circle here the z axis at a distance ... , the torus becomes a sphere. left The toric lens The greatest radius of curvature of the toric lens ... 1 R r , where n is the index of refraction of the lens material. The smallest radius of curvature, r , corresponds to the greatest refractive power, nowrap 1 s n 1 r . Since nowrap 1 R r r , nowrap S s . The lens behaves approximately like a combination of a spherical lens with optical power s and a cylindrical lens with power nowrap s S . In ophthalmology and optometry nowrap s S is called the cylinder power of the lens. ref This is used for correcting astigmatism. In this context, the term cylinder ... with a popular assumption, the toric lens is not an Spheroid ellipsoid of revolution . Working Ray ... of the eye. Atoric lens With modern computer controlled design, grinding and polishing techniques ... from the toric shape. This is called an atoric lens literally, non toric lens . ref http www.laramyk.com wp content uploads 2010 05 Principles of Atoric Lens Design.pdf Meister, D. Principles of Atoric Lens Design , in Lens Talk , Vol. 27, No. 3 Jan. 1998 ref ref http www.oculist.net downaton502 ... to toric lenses in the same way that aspheric lens es are related to spherical lenses. References references Category Geometrical optics Category Corrective lenses de Torische Linse nl Torische lens ... more details
Image Plasmat.png thumb right 250px Plasmat lens. The Plasmat lens is a widely used and long established photographic lenslens type, especially common in large format photography. It provides high correction of optical aberrations aberrations with a moderate maximum aperture e.g. f 5.6 link yes . It is a specific instance of the Dagor type Double Meniscus anastigmat. Double meniscus anastigmats use widely separated positive and negative surfaces, generally thick meniscus lenses, to achieve a flat field. The most basic form is two sharply curved meniscus elements located symmetrically about a stop. Further refinement of the form replaces the two simple meniscus lenses with achromats for chromatic correction. The Dagor type further refines these achromats into triplets with the following design parameters a high index, doubly convex DCX lens cemented to a medium index, doubly concave DCV lens cemented to a low index meniscus lens. Up to this point, all refinements have maintained symmetry ... in each group is a Lens optics Types of simple lenses positive meniscus , the outermost is Lens optics Types of simple lenses biconvex , and there is a Lens optics Types of simple lenses biconcave element between them. The Plasmat lens is made in many variants, e.g. departing from exact symmetry, adding a lens to one or both groups, or separating the innermost or outermost element from the rest ... macro lens es. Convertible lenses for large format photography often consist of Plasmat cells. See also Large format lens Paul Rudolph physicist References http books.google.co.jp books?id OJrJrEJ r9QC&dq 22a history of the photographic lens 22 rudolf kingslake&pg PP1&ots YY kaKy5aA&sig WOBds DaDP9DscZNJcU4Jke8KYc&hl ja&prev http www.google.co.jp search?q 22A History of the Photographic Lens ... title&cad one book with thumbnail PPA95,M1 A History of the Photographic Lens Rudolf Kingslake p ... Modern Lens Design Category Photographic lenses optics stub ... more details
Infobox photographic lenses name MS PELENG 3.5 8A Fisheye Lens image Peleng8.jpg caption maker BELOMO feat is none feat usm none feat sbf n a feat macro n a feat special Fisheye application n a type circular fisheye lens flength 8 mm flength eq fov 180 degrees aperture f 3.5 f 16 groups 7 elements 11 diaphragm close dist convert 0.22 m ft abbr on max mag max diameter convert 73.5 mm in abbr on max length convert 65.5 mm in abbr on weight convert 400 g oz abbr on filter rear Gelatin filter hood n a case av horiz 180 av vert 180 av diag 180 start stop replace msrp 399.99 category Soviet photographic lenses This lens is a super wideangle circular fisheye lens fisheye photographic lens, and is designed as a interchangeable lens for Canon company Canon , Nikon , Pentax , Olympus Corporation Olympus digital or film camera s which have or don t have the instant return diaphragm automatic control device. The lens has a variable diaphragm from f 3.5 to f 16. The lens has antireflective coating. This lens casts a 24mm image circle on a 24x36mm frame. It occupies only part of frame 24x36 and fits in a small side of a frame with a small cutting along the edges. The geometric centers of the image and the frame coincide. Gallery gallery File Flatiron fisheye.jpg The Flatiron Building , shot with the lens pointed nearly straight up File Mountaintop fisheye.jpg A mountaintop view, shot with the lens pointed nearly straight down gallery External links http www.belomo.by Belarusian Optical and Mechanical Association BELOMO http www.photozone.de canon eos 254 peleng 8mm f35 fisheye converted to eos mount test report review Peleng 8mm f 3.5 Fisheye converted to EOS mount Test Report Review http peleng8.com peleng feedbacks reviews feedbacks Peleng 8mm f 3.5 Reviews and feedbacks Category Soviet photographic lenses Category Photographic lenses ru sv Peleng optik ... more details
About the company the municipality Aclens, Switzerland Infobox company company name AC Lens company logo company type Privately Held foundation 1995 location Columbus, Ohio key people Peter Clarkson, Chief ..., Marketing Director br Robert Drumm, Marketing Manager industry contact lens retail products contact lens es homepage http www.aclens.com aclens.com AC Lens is a privately held company based in Columbus, Ohio that sells contact lens es and vision care products online. Origin Arlington Contact Lens Service, Inc AC Lens was formed in 1995 and launched in 1996 by Dr. Peter Clarkson in the back of an optometrist ... it How AC Lens Peter Clarkson can sleep at night ref AC Lens incorporated in the State of Ohio in 1998. In 2000, AC Lens acquired I Ohio LLC in an exchange of private stock. ref cite news url http www.bizjournals.com columbus stories 2000 11 20 story7.html title AC Lens acquires I Ohio in private stock exchange first Jeff last Bell date November 20, 2000 ref AC Lens now operates various websites ... Lens Consumers Act Effective date went into effect . This federal law requires that optical care providers release their patients Eyeglass prescription prescriptions to them. AC Lens was provided ... www.ftc.gov os comments contactlensrule 04 02235 0974.pdf title AC Lens response to Fairness To Contact Lens Consumer Act ref The final ruling on the law was released by the FTC in July 2004. ref cite ... to Contact Lens Consumers Act ref In October 2004, the FTC released a http www.ftc.gov bcp edu pubs business health bus62.shtm A Guide for Prescribers and Sellers Recognition AC Lens has been named ... title AC Lens inc 5000 ref and the Columbus Business First Fast 50. ref cite news url http columbus.bizjournals.com columbus stories 2009 10 19 tidbits10.html title AC Lens Columbus Fast 50 first Scott ... Lens recently earned the fifth consecutive Biz Rate circle of excellence award for outstanding customer ... Company Website http www.bizrate.com Shop and Compare Prices DEFAULTSORT Ac Lens Category Privately ... more details
Image Einzel lens.png thumb 300px Implementation of an Einzel lens showing the ion path. Six plates are parallel to the ion flight path with the middle plate at a particular potential. An einzel lens is a charged particle lens that focuses without changing the energy of the beam. It consists of three or more sets of cylindrical or rectangular tubes in series along an axis. It is used in ion optics to focus ion s in flight which is accomplished through manipulation of the electric field in the path of the ions. The lens elements are symmetric so the ions will regain their initial energy on exiting the lens although the velocity of the outer particles will be altered such that they converge on to the axis. This causes the outer particles to arrive at the focus optics focus intersection slightly later than the ones that travel along a straight path as they have to travel an extra distance. Theory Image Einzel lens 3d.png thumb right 250 px A perspective view of an einzel lens. The equation for the change in radial velocity for a particle as it passes between any pair of cylinders in the lens is math Delta v r int frac qE r r,z m 0v z dz math z is the axis passing through the middle of the lens. r is the direction normal to z. If the lens is constructed with cylindrical plates, the field is symmetrical around z. math E r r,z math is the magnitude of the electric field in the radial direction for a particle at a particular radial distance and distance across the gap, math m o math ... lens, thus an einzel lens can be described as two or more electrostatic immersion lenses. Solving ... to calculate the focal length of the lens. Application to television tubes Image Einzel lens ions.png thumb right 300px Path of ions as they travel through an einzel lens. The ion mass is 200 kDa accelerated ... are atypical for illustrative purposes . The einzel lens principle in a simplified form was also ... Cathode ray tube References Reflist Citation doi 10.1063 1.1686484 title Construction of an einzel lens ... more details
Refimprove date May 2007 Image Nikon Coolpix S4.jpg thumb 200px right Nikon Coolpix S4 with swivel lens A swivel lens is a lens that freely rotates while attached to a camera body. They are used on some compact digital camera compact digital and video cameras camcorder s . These lenses make it easy for a photographer to aim a camera without moving around too much. Swivel lenses come in different sizes and shapes. A swivel lens is also known as a swiveling lens, swivelling lens, and rotating lens. In contrast, swivel LCD s also known as articulating screen are displays that freely rotate while attached to a camera body. Usually, the camera body is much larger than the swivelling display. Swivel LCD devices can be considered to be swivel lens devices because the camera body with lens can swivel around the small display albeit, aiming the camera is more difficult. Most camcorders have a swivel LCD. Uses Enables the user to take pictures from unique perspectives and camera angles Easy composition of images without the need to bend, crouch, or move around Shooting self portraits Shooting candid photos List of cameras that have swivel lens Nikon Coolpix 2500 ref http www.creativepro.com story news 15770.html?origin story ref , 3500 ref http www.dpreview.com news 0209 02091901nikoncp3500.asp ref , Nikon 4500 4500 Nikon Coolpix S4 ref http www.dpreview.com news 0509 05090103nikon coolpixs4.asp ref , S10 Nikon Coolpix 900, Nikon Coolpix 950 950 , 990, Nikon Coolpix 995 995 ref http www.dpreview.com reviews nikoncp995 ref Sony DSC U50 ref http www.dpreview.com news 0308 03081501sonydscu50.asp ... swivel lens digital cameras list and compare joy of twisting title Swivelers Swivel lens digital ... lens Sony Clie PDA various PEG XXXX models Sony PlayStation Portable Go Cam camera Game Boy Camera ... swivel lens Some cellphones have lens that rotate and allow users to take self portraits but are limited ... known as Samsung D820 Samsung A930 Nokia 3250 See also commonscat Swivel lens Articulating screen References ... more details
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