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Telephoto lens

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467: 455: 528:, and two of these can be unequivocally dated as having been taken during May 1886. One of McKay's photographs shows a warship anchored in Wellington harbour about two and a half kilometres away, with its rigging lines and gun ports clearly visible. The other, taken from the same point, is of a local hotel, the Shepherds Arms, about 100 metres distant from the camera. The masts of the ship are visible in the background. McKay's other photographic achievements include photo-micrographs, and a ‘shadow-less technique’ for photographing fossils. 38: 94: 106: 2633: 183: 163: 2644: 907: 254: 888: 178:
As a group, the front (object-facing) elements in a telephoto lens collectively have a positive focus, with an overall focal length that is shorter than the effective focal length of the lens. The converging rays from this group are intercepted by the rear (image-facing) lens group, sometimes called
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element of a given focal length; to focus on an object at infinity, the distance from this single lens to focal plane of the camera (where the sensor or film is) has to be adjusted to the focal length of that lens. For example, given a focal length of 500 mm, the distance between lens and focal
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The simplest telephoto lens can be regarded as having two elements: one (on the object side) converging and another (on the image side) diverging. Again, in practice, more than one element is used in each group to correct for various aberrations. The combination of these two groups produces a lens
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of a simple ("non-telephoto") lens is within the construction, the telephoto lens moves the optical centre in front of the construction. In other words, a telephoto lens might have a focal length of 400 mm, while it is shorter than that. While the length of a long-focus lens approximates its
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to relay the image that extends the light cone the same way the negative lens telephoto group does. The mirrors also fold the light path. This makes them much shorter, lighter, and cheaper than an all refractive lens, but some optical compromises, primarily the "doughnut" shape of out-of-focus
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Starting in the mid-1970s, Japanese manufacturers introduced telephoto lenses which focused by moving the smaller (diverging) rear group, rather than moving the entire optical system as a unit; in some cases, a second converging group was added behind the diverging group. This was marketed as
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or inverted telephotos, which have greater clearance from the rear element to the film plane than their focal length would permit with a conventional wide-angle lens optical design. This allows for greater clearance for other optical or mechanical parts such as the mirror parts in a
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refers to the physical length of a lens divided by its focal length; where long-focus lenses have a telephoto ratio around 1, telephoto lenses have a ratio less than 1. As an example, one modern lens (
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the "telephoto group," which has a negative focus. This second group of elements spread the cone of light so that it appears to have come from a lens of much greater focal length.
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lenses with a large range of focal lengths. The lens is completely stored inside the camera in switched-off state and has a maximum focal length (shown) of 384 mm (calculated
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In 1883 or 1884, New Zealand photographer Alexander McKay discovered he could create a much more manageable long-focus lens by combining a shorter focal length telescope
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plane is 500 mm. The farther the focal length is increased, the more the physical length of such a simple lens makes it unwieldy. In practice, to minimize
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with the invention of the photographic telephoto lens in 1891, though it was independently invented by others about the same time; some credit his father
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Diagram of a typical telephoto lens with a large positive lens and a smaller negative telephoto group combined to create a much longer focal length -
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are the same for telephoto lenses of the same specified focal length. Long-focal-length lenses are often informally referred to as
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Inverting the telephoto configuration, employing one or more negative lens groups in front of a positive lens group, creates a
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McKay presented his work to the Wellington Philosophical Society (the precursor of the Royal Society of New Zealand) in 1890.
2221: 1709: 1496: 2130: 2062: 1815: 1342: 886:, Soichi Nakamura, "Telephoto lens system", published September 12, 1978, assigned to Nippon Kogaku K. K. 119: 2669: 2563: 2558: 499: 2568: 1840: 1347: 1982: 2294: 1885: 1183: 725: 506: 122:, instead of a single lens element, these simple lenses usually are constructed using several elements to form an 2261: 2211: 2171: 2024: 1910: 1860: 1557: 1501: 1357: 1114: 1039: 271: 2467: 2057: 1790: 1582: 563: 475: 946: 2427: 2231: 2135: 1999: 1850: 1687: 1592: 1235: 1124: 129:
But such simple lenses are not telephoto lenses, no matter how extreme the focal length – they are known as
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to modify the light cone. Some of his photographs are preserved in the holdings of the Turnbull Library in
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A diagram of light travel through a wide-angle lens showing how focal length can be shorter than the lens.
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This same property is achieved in camera lenses that combine mirrors with lenses. These designs, called
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that are telephotos at one extreme of the zoom range and retrofocus at the other are now common.
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that extends the light path to create a long-focus lens in a much shorter overall design. The
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A 150–500 mm telephoto zoom lens, physically much shorter than its maximum focal length.
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internal focusing, differential focusing, or rear focusing and the concept was derived from
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as the primary objective with some form of negative lens in front of the mirror to correct
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assembly that is physically shorter than a long-focus lens producing the same image size.
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focal length, a telephoto lens manages to be shorter than its focal length. The term
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Jacobson, Ralph; Ray, Sidney; Attridge, Geoffrey G.; Axford, Norman (2000-08-17).
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The telephoto lens design has also been used for wide angles; in the case of the
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The Real McKay: The remarkable life of Alexander McKay, geologist. (1841-1917)
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The concept of the telephoto lens, in reflecting form, was first described by
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highlights, are caused by the central obstruction from the secondary mirror.
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The Dictionary of Photography for the Amateur and Professional Photographer
30:"Telephoto" redirects here. For the technique for transmitting images, see 210:
The heaviest non-Catadioptric telephoto lens for civilian use was made by
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Telephoto lenses are sometimes divided into the further sub-types of
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Typical telephoto lens focal lengths (mm) for different formats
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with a physical length about the same as its focal length.
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3 part series on Cheap Super Telephoto Lenses (300-500mm)
726:"Wide-Angle vs. Telephoto: Which Lens Should You Choose?" 265:
with an increased back focal distance. These are called
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A simple photographic lens may be constructed using one
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lens with negative lenses and other optical parts from
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and has a focal length of 1700 mm with a maximum
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203 FE camera and weighs 256 kg (564 lb).
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London: Hazell, Watson, and Viney Ld. 585: 186:Diagram of a catadioptric mirrors lens. 1008:Further clarification: Why Telephoto? 7: 922:"Nikkor Lenses, Code No. 8C2-00-E05" 2539:Museums devoted to one photographer 839:. Dunedin: Otago University Press. 2081:Timeline of photography technology 978:. SPIE Optical Engineering Press. 947:"Canon FD Lenses, pub. C.-CE-132B" 290:Portrait photography § Lenses 25: 2642: 2632: 2631: 231:. It is designed for use with a 41:A collection of telephoto lenses 2643: 701:"FAQ: What is a Portrait Lens?" 699:Dam, Peter (November 7, 2022). 623:Smith, Gregory Hallock (2006). 1: 2131:Painted photography backdrops 2063:Golden triangle (composition) 1343:35 mm equivalent focal length 783:New York Times Staff (2004). 629:. 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While the 130: 128: 112: 89:Construction 82: 70: 67:focal length 50: 46: 44: 2619:Stereoscopy 2478:E-6 process 2473:Dye coupler 2401:color space 2314:Digiscoping 2307:camera back 2222:Philippines 2151:Visual arts 2141:Glass plate 2126:Heliography 2025:Composition 2000:Ultraviolet 1956:Stereoscopy 1951:Slow motion 1936:Scanography 1851:Kite aerial 1796:Contre-jour 1688:Post-mortem 1678:Pornography 1658:Neues Sehen 1593:Documentary 1527:Zone System 1502:Reciprocity 1428:Film format 1358:Backscatter 1336:Terminology 1206:beauty dish 1110:rangefinder 1075:light-field 1056:Photography 569:Barlow lens 554:Film format 443:2250–15000 402:35 mm 278:Zoom lenses 59:photography 2609:Lomography 2430:processing 2379:Print film 2295:comparison 2262:Uzbekistan 2212:Luxembourg 2172:Bangladesh 2121:Dufaycolor 2101:Box camera 2058:Simplicity 2015:Zoom burst 2010:Xerography 2005:Vignetting 1995:Time-lapse 1983:Tilt–shift 1876:Mordançage 1866:Luminogram 1831:Holography 1826:High-speed 1806:Fill flash 1791:Burst mode 1769:Techniques 1750:Vernacular 1745:Underwater 1740:Toy camera 1720:Still life 1648:Monochrome 1638:High-speed 1588:Cloudscape 1578:Conceptual 1480:Photograph 1465:Lens flare 1445:Film speed 1327:Zone plate 1273:wide-angle 1258:long-focus 872:: 461–465. 710:18 October 685:2017-02-08 580:References 526:Wellington 440:1000–2250 369:110–734.5 363:25.5–49.5 288:See also: 243:Olympus XA 236:Hasselblad 212:Carl Zeiss 77:and other 2554:Norwegian 2518:Stop bath 2463:Developer 2458:Cyanotype 2086:Ambrotype 2048:Lead room 1971:Slit-scan 1906:Photogram 1901:Panoramic 1811:Fireworks 1643:Landscape 1288:telephoto 1236:reflector 1231:monolight 1226:lens hood 1211:cucoloris 1152:safelight 1063:Equipment 660:1 October 574:Zoom lens 539:designs. 537:zoom lens 518:objective 513:in 1860. 502:in 1834. 496:Dioptrice 480:superzoom 474:like the 437:550–1000 429:550–3660 411:300–2000 397:195–1310 383:150–1000 366:49.5–110 331:(format) 194:, have a 32:Wirephoto 2664:Category 2638:Category 2334:CMOS APS 2232:Slovenia 2160:Regional 2106:Calotype 2043:Headroom 1921:Redscale 1836:Infrared 1786:Brenizer 1760:Wildlife 1683:Portrait 1628:Forensic 1618:Fine-art 1553:Aircraft 1543:Abstract 1423:F-number 1403:Exposure 1378:Clipping 1353:Aperture 1221:hot shoe 1147:enlarger 1142:Darkroom 974:(1992). 822:: 35–49. 543:See also 426:250–550 423:130–250 418:120 film 320:Angle of 300:portrait 216:aperture 57:used in 51:telelens 2649:Outline 2585:Related 2267:Vietnam 2252:Ukraine 2187:Denmark 2167:Albania 2146:Tintype 2073:History 2038:Framing 1931:Rollout 1896:Panning 1846:Kirlian 1755:Wedding 1633:Glamour 1613:Fashion 1598:Eclipse 1568:Banquet 1490:Albumen 1300:Monopod 1278:fisheye 1246:softbox 1100:pinhole 1090:instant 1080:digital 956:29 July 931:29 July 816:Tuhinga 705:Adorama 494:in his 450:History 408:135–300 394:90–195 380:65–150 324:(diag.) 2647:  2636:  2564:street 2559:Polish 2247:Turkey 2242:Taiwan 2227:Serbia 2217:Norway 2192:Greece 2177:Canada 1776:Afocal 1735:Street 1715:Sports 1698:Selfie 1653:Nature 1608:Erotic 1573:Candid 1548:Aerial 1536:Genres 1438:medium 1315:Tripod 1283:swivel 1196:Filter 1174:holder 1169:format 1070:Camera 982:  909:  890:  843:  793:  766:  633:  606:  405:70–135 391:45–90 388:APS-C 377:35–65 355:Super 352:Medium 335:34–18° 327:Sensor 304:medium 284:Naming 2569:women 2527:Lists 2483:Fixer 2361:Pixel 2290:D-SLR 2237:Sudan 2207:Korea 2202:Japan 2197:India 2182:China 1966:Strip 1891:Night 1871:Macro 1781:Bokeh 1725:Stock 1693:Ruins 1433:large 1263:prime 1241:snoot 1201:Flash 1179:stock 1120:still 1105:press 1095:phone 1085:field 950:(PDF) 925:(PDF) 470:Some 416:6×6 ( 341:8–1° 338:18–8° 308:super 296:short 153:DO IS 2597:film 2302:MILC 1801:ETTR 1663:Nude 1623:Fire 1522:Sync 1320:head 1268:zoom 1253:Lens 1216:gobo 1164:base 1159:Film 1135:view 980:ISBN 958:2024 933:2024 870:XIII 841:ISBN 791:ISBN 764:ISBN 712:2023 662:2006 631:ISBN 604:ISBN 374:4/3 329:size 322:view 115:lens 61:and 2339:CCD 1130:toy 1125:TLR 1115:SLR 360:1" 298:or 218:of 2666:: 868:. 864:. 820:29 818:. 814:. 703:. 678:. 653:. 588:^ 458:A 420:) 274:. 224:/4 159:. 151:/4 126:. 45:A 1048:e 1041:t 1034:v 988:. 960:. 935:. 849:. 799:. 772:. 714:. 688:. 664:. 639:. 612:. 222:f 170:. 168:f 149:f 34:. 20:)

Index

Portrait lens
Wirephoto

long-focus lens
photography
cinematography
focal length
angle of view
effects of long-focus lenses

long-focus lens

lens
optical aberrations
achromatic lens
long-focus lenses
optical centre
Canon EF 400 mm f/4 DO IS
diffractive optics


catadioptric, 'reflex', or 'mirror' lenses
curved mirror
optical aberrations
secondary mirror
Carl Zeiss
aperture
f/4
entrance pupil
medium format

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