photography - depth of field

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  • 7/28/2019 Photography - Depth of Field

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    Copyright Aladin Abdel Naby

    FocusFocus

    Slightly out of focus

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    Sharp and in focusSharp and in focus

    Slightly out of focusSlightly out of focus

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    Depth of fieldDepth of field

    Depth of Field is always in effect on the lens axisDepth of Field is always in effect on the lens axis

    CameraCamera

    ObjectObject

    AxisAxis Depth of Field /Depth of Field /

    TableTable

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    LensLens \\ :: 5050

    F /F / 2.82.8

    LensLens \\ :: 5050

    F /F / 88

    LensLens \\ :: 5050

    F /F /1616

    MM

    MM

    MM

    AxisAxis

    11 22 33 44 6655 77

    11 22 33 44 6655 77

    11 22 33 44 6655 77

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    ObjectObject

    DistractionDistraction

    What is the picture?What is the picture?

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    Center of focusCenter of focus

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    S: 1/160 f/16S: 1/160 f/16 1601601616

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    S: 1/160 f/2.8S: 1/160 f/2.8 1601602.82.8

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    The wider the aperture = the smaller the DOFThe wider the aperture = the smaller the DOF

    The narrower the aperture = the bigger the DOFThe narrower the aperture = the bigger the DOF

    Aperture and DOFAperture and DOF

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    Lenses and DOFLenses and DOF

    The wider the lens = the bigger the DOFThe wider the lens = the bigger the DOF

    == The longer the lens = the smaller the DOFThe longer the lens = the smaller the DOF==

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    300 mm lens very short DOF300 mm lens very short DOF

    300300

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    A 75A 75--250mm lens250mm lens 7575--250250

    Focal length 75mm at f/22Focal length 75mm at f/22 75752222

    3.403.401010

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    A 75A 75--250mm lens250mm lens 7575--250250

    Focal lengthFocal length 250250 mm at f/22mm at f/22 2502502222

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    7575 mmmm250 mm250 mm

    Difference between the 75 and 250mm DOFDifference between the 75 and 250mm DOF

    7575250250

    f/22f/22 at 5 meter focusat 5 meter focus

    55 2222

    DOF is from 3.4 to 10 metersDOF is from 3.4 to 10 meters

    3.43.41010DOF is fromDOF is from 4.84.8 toto 5.25.2 metersmeters

    4.84.85.25.2

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    Hyperfocal distanceHyperfocal distance