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    <title>Biology for Photographers: Why is the Aperture Scale Logarithmic?</title>
    <dc:date>2011-05-06T14:17:22+00:00</dc:date>
    <link>http://www.petapixel.com/2011/05/05/biology-for-photographers-why-is-the-aperture-scale-logarithmic/?utm_source=feedburner</link>
    <dc:creator>zachwise</dc:creator><description><![CDATA[One of the main stumbling points for new photographers is the seemingly random series of numbers that we have come to know as the f-stop scale or aperture scale. Things start out innocently enough f/1, f/1.4 (just add 0.4 every time, right?), but things get ugly quickly — f/2, f/2.8, f/4. Why would anyone invent such an arbitrary scale?<br />
<br />
To answer, we must go back to the second century BC.]]></description>
<dc:subject>photography math</dc:subject>
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    <title>Biology for Photographers: Why is the Aperture Scale Logarithmic?</title>
    <dc:date>2011-05-06T14:08:03+00:00</dc:date>
    <link>http://www.petapixel.com/2011/05/05/biology-for-photographers-why-is-the-aperture-scale-logarithmic/</link>
    <dc:creator>zachwise</dc:creator><description><![CDATA[One of the main stumbling points for new photographers is the seemingly random series of numbers that we have come to know as the f-stop scale or aperture scale. Things start out innocently enough f/1, f/1.4 (just add 0.4 every time, right?), but things get ugly quickly — f/2, f/2.8, f/4. Why would anyone invent such an arbitrary scale?

To answer, we must go back to the second century BC.]]></description>
<dc:subject>photography math</dc:subject>
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