Knowledge (XXG)

35 mm equivalent focal length

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38: 2175: 2186: 107:(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. 87:
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.
83:. 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 2143: 190:, 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. 2090: 68:. The term is popular because in the early years of digital photography, most photographers experienced with interchangeable lenses were most familiar with the 2133: 2085: 1870: 735: 398:, 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. 543: 841: 588: 2138: 2080: 1632: 1841: 41:
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
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This definition is also in the 582: 433:What is "35 mm equivalent focal length?" 8: 503:"What is equivalence and why should I care?" 2134:Conservation and restoration of photographs 1871:Comparison of digital and film photography 589: 575: 567: 428: 426: 146:, and even higher for built-in cameras of 2091:Photographs considered the most important 158:) Ă— focal length of the lens of the DSC. 205: 422: 7: 2086:Museums devoted to one photographer 1633:Timeline of photography technology 57:for a particular combination of a 51:35 mm equivalent focal length 25: 2184: 2174: 2173: 2185: 79:, and a 200 mm lens is a 1: 1683:Painted photography backdrops 1615:Golden triangle (composition) 890:35 mm equivalent focal length 150:like cell phones or tablets. 18:35mm equivalent focal length 1393:Intentional camera movement 435:The Panorama Factory, 2004. 2228: 2081:Most expensive photographs 1438:Multi-exposure HDR capture 29: 2169: 162:Depth of field equivalent 2015:Digital image processing 481:"Digital Depth of Field" 30:Not to be confused with 1688:Photography and the law 544:Focal Length Conversion 144:compact digital cameras 2212:Science of photography 2035:Gelatin silver process 1059:Science of photography 1044:Photographic processes 1022:Perspective distortion 184:full-frame digital SLR 97:CIPA guideline DCG-001 42: 32:effective focal length 1493:Schlieren photography 1032:Photographic printing 955:Exposure compensation 349:3:2 (sensor diagonal 263:4:3 (sensor diagonal 138:APS-C format, 2Ă— for 40: 1277:Straight photography 915:Chromatic aberration 53:is a measure of the 2144:photographic plates 1829:Digital photography 1007:Hyperfocal distance 920:Circle of confusion 212:diagonal-based EFL 1648:Autochrome Lumière 1643:Analog photography 1468:Pigeon photography 1257:Social documentary 736:discontinued films 526:Vincent Bockaert, 306:3:2 (sensor width 220:4:3 (sensor width 43: 2199: 2198: 2000:Collodion process 1936:Chromogenic print 1923:Color photography 1433:Multiple exposure 1408:Lo-fi photography 935:Color temperature 501:Butler, Richard. 391: 390: 140:Micro Four Thirds 127:format, 1.5Ă— for 66:image sensor size 16:(Redirected from 2219: 2188: 2187: 2177: 2176: 2055:Print permanence 2005:Cross processing 1963:CMYK color model 1948:Color management 1901:Foveon X3 sensor 1896:Three-CCD camera 1540:Miniature faking 1498:Sabattier effect 1110:Astrophotography 965:Zebra patterning 591: 584: 577: 568: 531: 524: 518: 517: 515: 513: 498: 492: 491: 489: 487: 476: 470: 469: 467: 466: 460: 454:. 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Index

35mm equivalent focal length
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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