Kecepatan lensa: Perbedaan antara revisi
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Baris 10:
Pada [[1911 Encyclopaedia Britannica]] didefinisikan klasifikasi kecepatan lensa:
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"...[Lenses] are also sometimes classified according to their rapidity, as expressed by their effective apertures, into extra rapid, with apertures larger than f/6; rapid, with apertures from f/6 to f/8; slow, with apertures less than f/11."
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