Instrument Research Association, page 184 ref A sub type of air spaced doublet is the Dialyte lens ..., Basic optics and optical instruments, page AJ 4 ref References Reflist DEFAULTSORT DoubletLens Category Lenses Optics stub fr Doublet optique pl Dublet optyka pt Dubleto zh ...Other uses Doublet disambiguation Refimprove date December 2009 File Achromat doublet en.svg right thumb An achromatic doublet . In optics , a doublet is a type of lens optics lens made up of two simple lens es paired together. Such an arrangement allows more optical surfaces, thicknesses, and formulations, especially as the space between lenses may be considered an element. With additional degrees of freedom , optical designers have more latitude to correct more Aberration in optical systems optical aberrations , more thoroughly. Types Doublets can come in many forms, though most commercial doublets are achromat s, which are optimized to reduce chromatic aberration while also reducing spherical aberration and other Aberration in optical systems optical aberrations . The lenses are made from glasses with different refractive index refractive indices and different amounts of Dispersion optics dispersion . Often one element is made from Crown glass optics crown glass and the other from flint glass . This combination produces a better image than a simple lens. Trilobite s, which are now extinct, had natural doublet lenses. Apochromat s can also be made as doublets. Doublets can be air spaced, cemented, or oiled. Oiled doublets hold the optical fluid in place with surface tension alone. In a cemented doublet, the lenses are held together by an adhesive with mechanical strength, such as optically transparent epoxy . Canada balsam was traditionally used for this purpose. Some doublets use no adhesive between the lenses, relying on external fixturing to hold them together, either because the optical design requires a gap or because thermal expansion differences between the two lenses ... more details
wiktionary doubletDoublet may refer to Doublet clothing , a man s snug fitting buttoned jacket that was worn from the late 14th century to the mid 17th century Doublet lapidary , an assembled gem composed in two sections, such as a garnet overlaying green glass Doubletlens , a type of lens, made up of two stacked layers with different refractive indices Doublet linguistics , one of two or more words of the same language that come from the same root Doublet physics , a quantum state of a system with a spin of Doublet potential flow , fluid flow due to a source sink combination Pierre Jean Louis Ovide Doublet 1749 1824 , a politician and writer from France Word ladder or doublets , a word game invented by Lewis Carroll In mathematics, the unit doublet is the derivative of the Dirac delta function In textual criticism , two different narrative accounts of the same actual event Dimeresia Dimeresia howellii , a tiny flowering plant. disambig de Dublette fr Doublet nl Doublet pl Dublet ... more details
Other uses Doublet disambiguation Unreferenced date March 2009 A doublet is a type of gem composed in two sections. It is sometimes used to imitate other, more expensive gems. File Opal doublet.jpg thumb 250px right Opal Doublet A garnet and glass doublet uses a top portion of natural garnet fused to any color of glass to imitate a Gemstone gem . The color of glass used in the doublet is all that is seen, as the garnet provides no color. If seen in reflected light, a separation line may be seen. A harder garnet makes the stones more durable. In the case of opal doublets, a backing layer of onyx or matrix ironstone gives the more fragile opal layer support and can make the opal look darker and higher quality. Category Gemstones decorative art stub ... more details
Infobox hot spring name Doublet Pool photo Doublet Pool closeup.JPG photo width photo caption Doublet Pool name origin location Yellowstone National Park , Teton County, Wyoming Teton County , Wyoming Wyoming, USA lat d 44.4643188 lat NS N long d 110.8296237 long EW W region US WY coords ref ref name rcn cite rcn 9108 Doublet Pool ref elevation convert 7356 ft ref cite gnis 1609384 Doublet Pool ref type Hot spring height duration frequency discharge temperature convert 194.4 F C depth convert 8 ft m map map caption Doublet Pool is a hot spring in the Geothermal areas of Yellowstone Upper Geyser Basin Upper Geyser Basin of Yellowstone National Park , Wyoming . Doublet Pool is convert 8 ft m deep and its temperature is approximately convert 194.4 F C . ref cite web url http www.yellowstonenationalpark.com uppergeyser.htm title Geysers Upper Geyser Basin accessdate 2009 03 10 publisher YellowstoneNationalPark.com ref Its scalloped edge is made of geyserite . Although geysers rarely occur in Doublet Pool, only two or three have been seen the pool on the right pulses over the vents about every two hours. ref cite web title Doublet Pool work Geysers of Yellowstone publisher Geyser Observation and Study Association GOSA url http www.geyserstudy.org geyser.aspx?pGeyserNo DOUBLETPOOL ref Sometimes, there will be vibrations, surface wave motion, and thumping these are probably caused by collapsing gas and steam bubbles deep underground. ref cite web url http www.nps.gov archive yell tours oldfaithful doubletp.htm title Doublet Pool work Old Faithful Area Tour publisher National Park Service ref See also List of Yellowstone geothermal features Yellowstone National Park Geothermal areas of Yellowstone References reflist commons category Doublet Pool Upper Geyser Basin Wyoming Category Geysers of Wyoming Category Geothermal features of Teton County, Wyoming Category Yellowstone geothermal features da Doublet Pool ... more details
Expand French topic gov date December 2008 Michel Doublet born 26 September 1939 is a France French politician and a member of the Senate of France . He represents the Charente Maritime department and is a member of the Union for a Popular Movement Party. References http www.senat.fr senfic doublet michel89014n.html Page on the Senate website Senators of France Persondata Metadata see Wikipedia Persondata . NAME Doublet, Michel ALTERNATIVE NAMES SHORT DESCRIPTION French politician DATE OF BIRTH 26 September 1939 PLACE OF BIRTH DATE OF DEATH PLACE OF DEATH DEFAULTSORT Doublet, Michel Category 1939 births Category Living people Category French Senators of the Fifth Republic Category French politicians France politician UMP stub fr Michel Doublet ... more details
Earthquakes Expert subject Earthquakes date March 2011 Seismologist s sometimes refer to a a pair of similarly sized earthquake shocks that occur relatively closely spaced in time and location as an earthquake doublet. ref name USGS cite web title Magnitude 7.8 VANUATU Summary publisher USGS date 2009 10 07 url http earthquake.usgs.gov eqcenter recenteqsww Quakes us2009mlcx.php summary accessdate 2009 10 09 ref This is distinct from the normal pattern of earthquake aftershock s. The first earthquake can be some considerable distance and time away from the second. ref cite web url http www.scientificblogging.com news releases doublet earthquakes and earthquake dynamics title Doublet Earthquakes And Earthquake Dynamics date January 30, 2008 publisher scientificblogging.com accessdate 2010 02 03 ref References reflist External links http www.bssaonline.org cgi content abstract 89 5 1147 Worldwide doublets of large shallow earthquakes http www.nature.com nature journal v451 n7178 abs nature06521.html A great earthquake doublet and seismic stress transfer cycle in the central Kuril islands DEFAULTSORT Doublet Earthquake Category Types of earthquake earthquake stub ... more details
Other uses Doublet disambiguation Image Giovanni Battista Moroni 001.jpg thumb 250px The unidentified tailor in Giovanni Battista Moroni s famous portrait of ca 1570 is in doublet and lined and stuffed bombasted hose clothing hose . A doublet is a man s snug fitting buttoned jacket that is fitted and shaped ... century. The doublet was hip length or waist length and worn over the shirt or drawers. Until the end of the 15th century the doublet was worn under another layer of clothing such as a gown, mantle ... of the doublet met at the center front. Then, like many other originally practical items in the history ... use, the doublet served the same purpose to give fashionable shape and padding to the body, to support ... the doublet over its history was its style and cut. History Image Doubletvanda.jpg thumb left Doublet, 1635 1640 V&A Museum no. 177 1900 The doublet developed from the padded garments worn under armour, such as the gambeson , aketon , arming doublet . ref http www.chronique.com Library Armour armyd1.htm ... or breeches . Padding gradually fell out of fashion again, and the doublet became close fitting ... trimmed and pinked, long skirted late Tudor doublet under a crimson gown with hanging sleeves. Image Martin Frobisher by Ketel.jpg Martin Frobisher in a peascod bellied doublet under a buff Jerkin ... Countries, chose to be portrayed in his doublet, but still in a gorget , as if he were caught ... Charles 1 Mijtens.jpg thumb right 250px Charles I of England Charles I in the doublet and breeches ... pulled through eyelets on the breeches and the waist of the doublet to keep the breeches in place, and were tied in elaborate bows. The doublet fell permanently out of fashion in the mid 17th century ... of the modern suit clothes suit . Highland Dress Doublet is also a term describing a type of jacket ... feature epaulettes . The highland doublet is Jacobean era jacobean in style and may date to that period or earlier. The Regulation kilt doublet is a typically black double breasted jacket with satin ... more details
Infobox mountain name Doublet Peak photo photo caption elevation ft 13600 elevation ref prominence ft 200 prominence ref ref cite peakbagger pid 5369 name Doublet Peak, Wyoming accessdate 2007 09 19 ref location Fremont County, Wyoming Fremont Sublette County, Wyoming Sublette counties, Wyoming Wyoming, USA range Wind River Range coordinates coord 43 09 48 N 109 37 47 W type mountain region US display inline,title topo United States Geological Survey USGS Gannett Peak type age last eruption first ascent easiest route Doublet Peak is the fifth highest peak in the Wind River Range , Wyoming . The summit is immediately south of Dinwoody Glacier and just west of Mount Warren . ref cite web url http www.topoquest.com map.asp?lat 43.16333&lon 109.62889&datum nad27&u 4&layer DRG&size l&s 50 title Doublet Peak, USGS Gannett Peak WY format Map publisher TopoQuest accessdate 2008 06 29 ref Cited references reflist Category Geography of Fremont County, Wyoming Category Mountains of Wyoming Category Geography of Sublette County, Wyoming Wyoming geo stub ... more details
Unreferenced stub auto yes date December 2009 In quantum mechanics , a doublet is a quantum state of a system with a spin physics spin of 1 2, such that there are two allowed values of the spin component, 1 2 and 1 2. Quantum systems with two possible states are sometimes called two level system s. Essentially all occurrences of doublets in nature arise from rotational symmetry spin 1 2 is associated with the fundamental representation of the Lie group SU 2 , the group theory group that defines rotational symmetry in three dimensional space. History and applications The term doublet dates back to the 19th century, when it was observed that certain spectral lines of an ionized, excited gas would split into two under the influence of a strong magnetic field , in an effect known as the anomalous Zeeman effect . Such spectral lines were observed not only in the laboratory, but also in astronomical spectroscopy observations, allowing astronomers to deduce the existence of, and measure the strength of magnetic fields around the sun, stars and galaxies. Conversely, it was the observation of doublets in spectroscopy that allowed physicists to deduce that the electron had a spin, and that furthermore, the magnitude of the spin had to be 1 2. See the history section of the article on spin physics for greater detail. Doublets continue to play an important role in physics. For example, the healthcare technology of magnetic resonance imaging is based on nuclear magnetic resonance . In this technology, a spectroscopic doublet occurs in a spin 1 2 atomic nucleus , whose doublet splitting is in the radio frequency range. By applying both a magnetic field and carefully tuning a radio frequency transmitter, the nuclear spins will flip and re emit radiation, in an effect known as the Rabi ... to be measured. See also Singlet state Triplet state Spin multiplicity DEFAULTSORT Doublet State Category ... doublet ... more details
In mathematics, the unit doublet is the derivative of the Dirac delta function . It can be used to differentiate Signal electronics signals in electrical engineering ref citeweb url http ocw.mit.edu NR rdonlyres Electrical Engineering and Computer Science 6 003Fall 2003 9BEA2A94 230F 4F38 ABAE F552B8E549A9 0 lecture4.pdf title Signals and Systems Lecture 4 date 16 September 2003 work Mit.edu accessdate 2 September 2009 ref If u sub 1 sub is the unit doublet, then math x u 1 t frac dx t dt math where refers to the convolution operator. The function is zero for all values except zero, where its behaviour is interesting. Its integral over any interval enclosing zero is zero. However, the integral of its absolute value over any region enclosing zero goes to infinity. The function can be thought of as the limiting case of two rectangles, one in the second Cartesian coordinate system Quadrants and octants quadrant , and the other in the fourth. The length of each rectangle is k, whereas their breadth is 1 k sup 2 sup , where k tends to zero. References reflist DEFAULTSORT Unit Doublet Category Derivatives finance math stub ... more details
Image Pake.png thumb right 300px Simulated pake doublet. A Pake Doublet is a characteristic line shape seen in solid state nuclear magnetic resonance and Electron paramagnetic resonance . It was first described by George Pake . It arises from Solid state nuclear magnetic resonance Dipolar coupling dipolar coupling between two spin half nuclei, or from transitions in Solid state nuclear magnetic resonance Quadrupolar interaction quadrupolar nuclei such as deuterium. It is the general shape obtained from an orientationally dependent doublet. The horns of the Pake doublet correspond to the situation when the principal axis of the coupling interaction the inter nuclear vector in the case dipolar coupling and the principal component of the electric field gradient tensor for quadrupolar nuclei is perpendicular to the magnetic field. This situation is the most probable and the intensity is much higher. The feet of the lineshape correspond to the situation when the principal axis of the coupling interaction is parallel to the magnetic field which is much less statistically relevant. Pake was the first to describe this lineshape and used it to extracted the proton proton distance from his experiments on a single crystal and powdered hydrates of gypsum CaSO sub 4 sub .2H sub 2 sub O ref Nuclear Resonance Absorption in Hydrated Crystals Fine Structure of the Proton Line,G. E. Pake, J. Chem. Phys. 16 , 327 1948 doi 10.1063 1.1746878 http link.aip.org link JCPSA6 v16 i4 p327 s1 ref . This made it possible to experimentally determine the inter nuclear distance between the hydrogen atoms in water. References references physics stub Category Nuclear magnetic resonance ... more details
unreferenced date September 2008 A legal doublet is a standardized phrase used frequently in English legal language which consists of two or more words which are near synonyms. The origin of the doubling and sometimes even tripling often lies in the transition of legal language from Latin to French language French . Certain words were simply given in their Latin, French and or English language English forms to ensure understanding. Such phrases can often be pleonasm s. List of common legal doublets aid and abet appropriate and proper art and part by and between cancel, annul and set aside care and attention cease and desist covenant and agree deem and consider demise and lease due and payable final and conclusive full faith and credit give, devise and bequeath goods and chattels grant, bargain, sell indemnify and hold harmless legal and valid let or hindrance lewd and lascivious conduct liens and encumbrances make and enter into name, constitute and appoint null and void over and above part and parcel perform and discharge power and authority rest, residue and remainder right, title and interest sale or transfer sole and exclusive to have and to hold successors and assigns terms and conditions will and testament See also Hendiadys DEFAULTSORT Legal Doublet Category Legal terms Category Legal writing th ... more details
Other uses Doublet disambiguation Unreferenced date December 2009 In etymology , two or more words in the same language are called doublets or etymological twins or possibly triplets, etc. when they have different phonological forms but the same etymological root. Often, but not always, the variants have entered the language through different routes. Because the relationship between words that have the same root and the same meaning is fairly obvious, the term is mostly used to characterize pairs of words that have diverged in meaning. For example English language English pyre and fire are doublets. Subtle differences in the resulting modern words contribute to the richness of the English language, as indicated by the doublets frail and fragile which share the Latin root, fragilis one might refer to a fragile tea cup and a frail old woman , but frail tea cup and fragile old woman are uncommon. Another example of nearly synonymous doublets is aperture and overture the commonality behind the meanings is opening , but doublets may develop divergent meanings, such as the opposite words, host and guest from the same Proto Indo European language PIE root, which occur as a doublet in Latin and then Old French wikt hospes hospes , before having been borrowed into English. Doublets also vary with respect to how far their forms have diverged. For example, the resemblance between levy and levee is obvious, whereas the connection between sovereign and soprano is harder to guess synchronic analysis linguistics synchronically from the forms of the words alone. Etymological twins are often a result of chronologically separate borrowing from a source language. In the case of English, this usually ... root, but which have diverged in pronunciation and meaning. An example is the doublet lang zh ... in the same way DEFAULTSORT Doublet Linguistics Category Historical linguistics Category Types of words ar bg fr Doublet lexical ko nl Doublet taalkunde ja ru ... 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 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 nl 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 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 Writer Geoff Downes , Trevor Horn Producer Trevor Horn Last single Elstree song Elstree br 1980 This single I Am a Camera br 1981 Next single Adventures in Modern Recording song Adventures in Modern Recording br 1982 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 Overview The first version of the song ... Howe guitarist Steve Howe , Chris Squire and Alan White Yes drummer Alan White , and therefore, Into the Lens ... I Am a Camera was a Buggles 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 ... different lyrics, notably I will never let you go, and you always let the feelings show Into the Lens ... 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 ... more details
Use dmy dates date June 2011 Expand French date December 2009 Marie Anne Doublet 23 August 1677, Paris May 1771, Paris , known as Doublet de Persan , n e Legendre , was a French scholar, writer and salonni re . Persondata Metadata see Wikipedia Persondata . NAME Doublet ALTERNATIVE NAMES SHORT DESCRIPTION DATE OF BIRTH 23 August 1677 PLACE OF BIRTH DATE OF DEATH 1771 PLACE OF DEATH DEFAULTSORT Doublet Category Salon holders Category French writers Category 1677 births Category 1771 deaths France writer stub fr Marie Anne Doublet ... more details
In particle physics , the doublet triplet splitting problem is a problem of some Grand unification theory Grand Unified Theories , such as Georgi Glashow model SU 5 , SO 10 physics SO 10 , math E 6 math . Grand unified theories predict Higgs boson s doublets of math SU 2 math arise from Group representation representations of the unified group that contain other states, in particular, states that are triplets of color. The primary problem with these color triplet Higgs, is that they can mediate proton decay in Supersymmetry supersymmetric theories that are only suppressed by two powers of GUT scale ie they are dimension 5 supersymmetric operators . In addition to mediating proton decay, they alter gauge coupling unification . The doublet triplet problem is the question what keeps the doublets light while the triplets are heavy? Doublet triplet splitting and the math mu math problem In minimal SU 5 , the way one accomplishes doublet triplet splitting is through a combination of interactions math int d 2 theta lambda H bar 5 Sigma H 5 mu H bar 5 H 5 math where math Sigma math is an adjoint of SU 5 and is traceless . When math Sigma math acquires a vacuum expectation value math langle Sigma rangle rm diag 2, 2, 2, 3, 3 f math that breaks SU 5 to the Standard Model gauge symmetry the Higgs doublets and triplets acquire a mass math int d 2 theta 2 lambda f mu H bar 3 H 3 3 lambda f mu H bar 2 H 2 math Since math f math is at the GUT scale math 10 16 math GeV and the Higgs doublets ... to solve thus doublet triplet splitting problem requries a tuning of the two terms to within 1 part ... MSSM i.e. why are the Higgs doublets so light and doublet triplet splitting are so closely intertwined. The Dimopoulos Wilczek mechanism In an SO 10 theory, there is potential solution to the doublet ... f 3 math give masses to the Higgs doublet and triplet, respectively, and are independent of each ... doublet remains massless. This is very similar to the way that doublet triplet splitting ... 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 Doubletlens Aspheric lens DEFAULTSORT Simple Lens Category Photographic lenses Category Lenses Optics stub zh ... 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 the exact 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
The Petzval lens was developed in 1840 by Joseph Petzval . It consisted of two doublet lenses with an aperture stop in between. The front lens is well corrected for spherical aberrations but introduces Coma optics coma . The second doublet corrects for this and the position of the stop corrects most of the astigmatism . However, this results in additional field curvature and vignetting . The total field of view is therefore restricted to about 30 degrees. An f number of f 3.7 was achievable, which was considerably faster than other lenses of the time. The speed of the lens is ideal for portrait photography since the exposure time could be reduced. Image Petzval.png thumb left Petzval portrait lens. Image Petzval1.png thumb right Petzval type movie projection lens. Image Petzval03.png thumb 300px center Petzval objectives. References cite book last Ray first Sidney title Applied Photographic Optics year 2002 publisher Focal Press location Oxford, UK isbn 0 240 51540 4 Category Photographic lenses Category Hungarian inventions de Petzvalobjektiv hu Petzval portr objekt v pl Obiektyw Petzvala ru ... more details
of achromat is the achromatic Doubletlensdoublet , which is composed of two individual lenses made from glass es with different amounts of Dispersion optics dispersion . Usually one element is a Lens optics Types of simple lenses concave lens made out of flint glass such as F2, which has relatively high dispersion, while the other, Lens optics Types of simple lenses convex , element is made ... surface counted from the object. A doubletlens has four surfaces with radii R sub 1 sub to R sub 4 sub . Littrow doublet Uses an equiconvex crown glass lens with R sub 1 sub R sub 2 sub , and a second ... doublet can produce a ghost image between R sub 2 sub and R sub 3 sub because the lens surfaces of the two ... surface and rear of the telescope tube. Fraunhofer doublet Fraunhofer objective The first lens has positive ... doublet. In contrast to the Fraunhofer doublet, it has a negative lens first followed by a positive lens. It needs stronger curvature than the Fraunhofer doublet. ref Kidger, M.J. 2002 Fundamental Optical ...Image Lens6a.svg thumb right Chromatic aberration of a single lens causes different wavelengths of light to have differing focal lengths. File Lens6b en.svg thumb right An achromatic doublet brings red and blue light to the same focus, and is the earliest example of an achromatic lens. File Achromatic focal curve.svg thumb right In an achromatic lens, two wavelengths are brought into the same focus, here red and blue. An achromatic lens or achromat is a lens optics lens that is designed to limit ... es may be used instead. The lens elements are mounted next to each other, often cemented together, and shaped ... common type illustrated at right , the positive Optical power power of the crown lens element is not quite equalled by the negative power of the flint lens element. Together they form a weak positive lens that will bring two different wavelength s of light to a common focus optics focus . Negative ... doublet is often given to an English barrister and amateur optician named Chester Moore Hall . ref ... more details
Image Barlow lens.svg thumb Cone of light behind a doublet objective optics object lens A without red and with green a Barlow lens B 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 ... publisher Scientific American year 1953 pages 277 286 chapter The Barlow Lens isbn ref Since the magnification ... lens is changed by adding an extension tube between the Barlow and the eyepiece to increase the magnification. The amount of magnification is one more 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 ... alone. If the length of a standard 2x Barlow lens tube is doubled, the lenses are separated .... Photography use Teleconverter s are variations on Barlow lens that have been adapted for photographic ... 492 ref . It increases the effective focal length of a photographic lens it is attached to, making it a telephoto lens . A true telephoto lens uses 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 ... Barlow Lens Category Lenses de Barlowlinse fa fr Lentille de Barlow it Lente di Barlow ... more details
by using an Achromatic lens achromatic doublet or achromat in which two materials with differing ... under the design conditions. Compound lenses See also Photographic lensDoubletlens Achromat ...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 ... Gate Bridge refraction refracted in rain droplets , which act as lenses File Convex lens flipped image.JPG thumb right Image of a plant as seen through a biconvex 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 ... 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 ... more details
Doublet was also the specified lens in the official daguerreotype instructions issued by the French ... lens also known as photographic lens or photographic objective is an optics optical lens optics lens .... 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 for photographic use and possibly mass production. There is no major difference in principle between a lens used ... design and construction are different. A lens may be permanently fixed to a camera, or it may be interchangeable lens camera interchangeable with lenses of different focal length s, aperture s, and other .... Light rays 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 ... 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 with a focal length equal to the distance to the film plane assuming ... below right because the convex 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 ... image of the aperture as seen from the world is known as the lens s entrance pupil ideally, all rays ... 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 s exit pupil . gallery widths 200px Image Big pinhole.svg ... arbitrarily small. Image Big 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 ... 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
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