27:
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96:(width-to-height ratio) of 3:2, while many digital cameras have a 4:3 aspect ratio, which have different diagonal-to-width ratios, these two definitions are often not equivalent, i.e., the equivalent focal length based on the diagonal angle of view differs from the equivalent focal length based on the horizontal angle of view.
76:
and the angle of view due to possibilities of using various image sensor sizes at the same focal length (i.e., a different image sensor size resulting in a different angle of view at the same lens focal length). The 35 mm equivalent focal length of a particular lens–sensor combination is the
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A standard 35 mm film image is 36 mm wide by 24 mm tall (35 mm refers to the height of the film including the perforations for film transport), and the diagonal is 43.3 mm. This leads to the following conversion formulas for a lens with a true focal length
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According to CIPA guidelines, 35 mm equivalent focal length is to be calculated like this: "Converted focal length into 35 mm camera" = (Diagonal distance of image area in the 35 mm camera (43.27 mm) / Diagonal distance of image area on the image sensor of the
382:
For historical reasons, sensor size specifications such as 1/2.5" do not match the actual sensor size, but are a bit larger (typically about a factor of 1.5) than the actual sensor diagonal. This is because these sensor size specifications refer to the size of a
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Equivalent depth of field can be calculated the same way using the crop factor. For example, a 50mm f/2 lens on a 2Ă— crop factor Micro Four Thirds camera would be equivalent to a 100 mm (= 2Ă—50 mm) f/4 (= f/(2Ă—2)) lens on a
77:
focal length that one would need for a 35 mm film camera to obtain the same angle of view. Two lens-sensor combinations with the same 35 mm equivalent focal length are expected to have the same angle of view.
72:. Because digital cameras have mostly replaced film cameras and the image sensor size that also determines the angle of view is not standardized as the film size was, there is no uniform relation between the lens
179:, depth of field, total light gathered, and diffraction effects. However for the purposes of exposure calculations the aperture does not change for different sensor sizes.
57:. The term is popular because in the early years of digital photography, most photographers experienced with interchangeable lenses were most familiar with the
2132:
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387:, while the usable sensor size is about 2/3 of the size of the tube. Tubes are not used on digital cameras, but the same specifications are used.
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The resulting images from 50 mm and 70 mm lenses for different sensor sizes; 36x24 mm (red) and 24x18 mm (blue)
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Apart from the width- and diagonal-based 35 mm equivalent focal length definitions, there is a third definition:
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35 mm equivalent focal lengths are calculated by multiplying the actual focal length of the lens by the
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1391:
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1032:
888:
645:
570:
1998:
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1321:
1113:
1958:
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1530:
1381:
1218:
1123:
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655:
469:
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format, 2.7Ă— for 1-inch sensors (used in Nikon 1 cameras and some Sony RX cameras), 5Ă— to 6Ă— for
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438:"CIPA DCG-001-Translation-2005 Guideline for Noting Digital Camera Specifications in Catalogs"
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angle of view. Since 35 mm film is normally used for images with an
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Most commonly, the 35 mm equivalent focal length is based on equal
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mm. However, it is not clear to what extent this definition is used.
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Quoted 35 mm equivalent focal lengths typically ignore
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On any 35 mm film camera, a 28 mm lens is a
163:. The DOF of smaller sensors is deeper at a given
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159:(DOF), which depends on both focal length and
88:. Alternatively, it may sometimes be based on
84:angle of view. This definition is also in the
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422:What is "35 mm equivalent focal length?"
492:"What is equivalence and why should I care?"
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2123:Conservation and restoration of photographs
1850:Comparison of digital and film photography
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135:, and even higher for built-in cameras of
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147:) Ă— focal length of the lens of the DSC.
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68:, and a 200 mm lens is a
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139:like cell phones or tablets.
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1372:Intentional camera movement
424:The Panorama Factory, 2004.
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2065:Most expensive photographs
1417:Multi-exposure HDR capture
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1999:Digital image processing
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19:Not to be confused with
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1667:Photography and the law
533:Focal Length Conversion
133:compact digital cameras
2201:Science of photography
2019:Gelatin silver process
1043:Science of photography
1028:Photographic processes
1006:Perspective distortion
173:full-frame digital SLR
86:CIPA guideline DCG-001
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21:effective focal length
1472:Schlieren photography
1016:Photographic printing
939:Exposure compensation
338:3:2 (sensor diagonal
252:4:3 (sensor diagonal
127:APS-C format, 2Ă— for
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1261:Straight photography
899:Chromatic aberration
42:is a measure of the
2133:photographic plates
1808:Digital photography
991:Hyperfocal distance
904:Circle of confusion
201:diagonal-based EFL
1627:Autochrome Lumière
1622:Analog photography
1447:Pigeon photography
1241:Social documentary
720:discontinued films
515:Vincent Bockaert,
295:3:2 (sensor width
209:4:3 (sensor width
32:
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1979:Collodion process
1915:Chromogenic print
1902:Color photography
1412:Multiple exposure
1387:Lo-fi photography
919:Color temperature
490:Butler, Richard.
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129:Micro Four Thirds
116:format, 1.5Ă— for
55:image sensor size
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2039:Print permanence
1984:Cross processing
1942:CMYK color model
1927:Color management
1880:Foveon X3 sensor
1875:Three-CCD camera
1519:Miniature faking
1477:Sabattier effect
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468:Atkins, Bob.
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450:on 2017-02-02
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44:angle of view
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28:
22:
2145:Polaroid art
2034:K-14 process
2029:Instant film
2024:Gum printing
1974:C-41 process
1959:Photographic
1860:Image sensor
1855:Film scanner
1509:Sun printing
1442:Print toning
1234:space selfie
1204:Pictorialism
1134:Ethnographic
1114:Conservation
986:Guide number
981:Focal length
873:
547:Focal Length
541:large format
517:Sensor sizes
511:
499:. Retrieved
495:
485:
473:. Retrieved
463:
452:. Retrieved
445:the original
399:
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94:aspect ratio
89:
81:
79:
74:focal length
63:
53:and film or
39:
33:
16:Camera setup
2150:Stereoscopy
2009:E-6 process
2004:Dye coupler
1932:color space
1845:Digiscoping
1838:camera back
1753:Philippines
1682:Visual arts
1672:Glass plate
1657:Heliography
1556:Composition
1531:Ultraviolet
1487:Stereoscopy
1482:Slow motion
1467:Scanography
1382:Kite aerial
1327:Contre-jour
1219:Post-mortem
1209:Pornography
1189:Neues Sehen
1124:Documentary
1058:Zone System
1033:Reciprocity
959:Film format
889:Backscatter
867:Terminology
737:beauty dish
641:rangefinder
606:light-field
587:Photography
385:camera tube
198:Image size
183:Conversions
106:crop factor
100:Calculation
36:photography
2140:Lomography
1961:processing
1910:Print film
1826:comparison
1793:Uzbekistan
1743:Luxembourg
1703:Bangladesh
1652:Dufaycolor
1632:Box camera
1589:Simplicity
1546:Zoom burst
1541:Xerography
1536:Vignetting
1526:Time-lapse
1514:Tilt–shift
1407:Mordançage
1397:Luminogram
1362:Holography
1357:High-speed
1337:Fill flash
1322:Burst mode
1300:Techniques
1281:Vernacular
1276:Underwater
1271:Toy camera
1251:Still life
1179:Monochrome
1169:High-speed
1119:Cloudscape
1109:Conceptual
1011:Photograph
996:Lens flare
976:Film speed
858:Zone plate
804:wide-angle
789:long-focus
454:2015-10-19
406:References
90:horizontal
59:35 mm film
2085:Norwegian
2049:Stop bath
1994:Developer
1989:Cyanotype
1617:Ambrotype
1579:Lead room
1502:Slit-scan
1437:Photogram
1432:Panoramic
1342:Fireworks
1174:Landscape
819:telephoto
767:reflector
762:monolight
757:lens hood
742:cucoloris
683:safelight
594:Equipment
501:22 August
2195:Category
2169:Category
1865:CMOS APS
1763:Slovenia
1691:Regional
1637:Calotype
1574:Headroom
1452:Redscale
1367:Infrared
1317:Brenizer
1291:Wildlife
1214:Portrait
1159:Forensic
1149:Fine-art
1084:Aircraft
1074:Abstract
954:F-number
934:Exposure
909:Clipping
884:Aperture
752:hot shoe
678:enlarger
673:Darkroom
551:dpreview
496:DPReview
165:f number
161:aperture
82:diagonal
61:format.
2180:Outline
2116:Related
1798:Vietnam
1783:Ukraine
1718:Denmark
1698:Albania
1677:Tintype
1604:History
1569:Framing
1462:Rollout
1427:Panning
1377:Kirlian
1286:Wedding
1164:Glamour
1144:Fashion
1129:Eclipse
1099:Banquet
1021:Albumen
831:Monopod
809:fisheye
777:softbox
631:pinhole
621:instant
611:digital
368:= 43.3
351:= 43.3
325:= 36.0
308:= 36.0
282:= 45.0
265:= 43.3
239:= 36.0
222:= 34.6
2178:
2167:
2095:street
2090:Polish
1778:Turkey
1773:Taiwan
1758:Serbia
1748:Norway
1723:Greece
1708:Canada
1307:Afocal
1266:Street
1246:Sports
1229:Selfie
1184:Nature
1139:Erotic
1104:Candid
1079:Aerial
1067:Genres
969:medium
846:Tripod
814:swivel
727:Filter
705:holder
700:format
601:Camera
475:23 May
48:camera
38:, the
2100:women
2058:Lists
2014:Fixer
1892:Pixel
1821:D-SLR
1768:Sudan
1738:Korea
1733:Japan
1728:India
1713:China
1497:Strip
1422:Night
1402:Macro
1312:Bokeh
1256:Stock
1224:Ruins
964:large
794:prime
772:snoot
732:Flash
710:stock
651:still
636:press
626:phone
616:field
448:(PDF)
441:(PDF)
394:= 50
125:Canon
121:APS-C
118:Nikon
114:APS-H
112:"H")
110:Sigma
2128:film
1833:MILC
1332:ETTR
1194:Nude
1154:Fire
1053:Sync
851:head
799:zoom
784:Lens
747:gobo
695:base
690:Film
666:view
539:and
535:for
503:2019
477:2012
51:lens
1870:CCD
661:toy
656:TLR
646:SLR
549:at
392:EFL
376:mm
359:mm
333:mm
316:mm
290:mm
273:mm
247:mm
230:mm
145:DSC
34:In
2197::
494:.
429:^
414:^
366:35
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342:)
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192::
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