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

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

    exif:

    lang:en
    ApertureValue
    lang:en
    The lens aperture. The unit is the APEX value.
    lang:ja
    レンズ絞り値(APEX値)。この値のルート2のベキ乗を取ると、通常の絞り値となる。例えば'5'の場合だと√2^5=F5.6
    lang:en
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