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35 mm equivalent focal length

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27: 2164: 2175: 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
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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
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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: 2074: 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. 532: 2122: 2069: 1849: 30:
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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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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of the sensor. Typical crop factors are 1.26× – 1.29× for Canon (1.35× for
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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 2192: 432: 430: 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 571: 427: 422:What is "35 mm equivalent focal length?" 492:"What is equivalence and why should I care?" 150: 2123:Conservation and restoration of photographs 1850:Comparison of digital and film photography 578: 564: 417: 415: 135:, and even higher for built-in cameras of 2075:Photographs considered the most important 147:) Ă— focal length of the lens of the DSC. 461: 25: 412: 2193: 559: 2070:Museums devoted to one photographer 13: 1612:Timeline of photography technology 489: 467: 46:for a particular combination of a 40:35 mm equivalent focal length 14: 2212: 526: 2173: 2163: 2162: 2174: 585: 509: 483: 182: 99: 68:, and a 200 mm lens is a 1: 1662:Painted photography backdrops 1594:Golden triangle (composition) 874:35 mm equivalent focal length 405: 139:like cell phones or tablets. 7: 1372:Intentional camera movement 424:The Panorama Factory, 2004. 10: 2217: 2065:Most expensive photographs 1417:Multi-exposure HDR capture 18: 2158: 2115: 2057: 1957: 1900: 1806: 1690: 1602: 1554: 1299: 1066: 866: 593: 151:Depth of field equivalent 1999:Digital image processing 470:"Digital Depth of Field" 19:Not to be confused with 2107:Photography periodicals 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 31: 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 29: 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: 2188: 2187: 1979:Collodion process 1915:Chromogenic print 1902:Color photography 1412:Multiple exposure 1387:Lo-fi photography 919:Color temperature 490:Butler, Richard. 380: 379: 129:Micro Four Thirds 116:format, 1.5Ă— for 55:image sensor size 2208: 2177: 2176: 2166: 2165: 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 1094:Astrophotography 949:Zebra patterning 580: 573: 566: 557: 556: 520: 513: 507: 506: 504: 502: 487: 481: 480: 478: 476: 465: 459: 458: 456: 455: 449: 443:. 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Index

effective focal length

photography
angle of view
camera
lens
image sensor size
35 mm film
wide-angle lens
long-focus lens
focal length
CIPA guideline DCG-001
aspect ratio
crop factor
Sigma
APS-H
Nikon
APS-C
Canon
Micro Four Thirds
compact digital cameras
mobile devices
DSC
depth of field
aperture
f number
full-frame digital SLR
field of view
camera tube

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