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    exif:brightnessValue
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    http://www.w3.org/2003/12/exif/ns#brightnessValue

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    Copy 'PREFIX exif: <http://www.w3.org/2003/12/exif/ns#>'

    exif:

    lang:en
    BrightnessValue
    lang:en
    The value of brightness. The unit is the APEX value. Ordinarily it is given in the range of -99.99 to 99.99. Note that if the numerator of the recorded value is FFFFFFFF.H, Unknown shall be indicated.
    lang:ja
    画像撮影時の撮影対象物の明るさ(APEX値)。EVにするにはISO感度の値を足す必要があり、Ev:Exposure, Bv:BrightnessValue, Sv:SensitivityValueとしてEv=Bv+Sv Sv=log^2(ISOSpeedRating/3.125)という計算式を使う。ISO感度100の場合Sv=5、ISO200の場合Sv=6、ISO125ではSv=5.32
    lang:en
    37379