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Whilst the greatest effort has been made to ensure the quality of this text, due to the historical nature of this content, in some rare cases there may be minor issues with legibility. Since the wink or reflex action does not occur until one-twelfth of a second after the flash has. Commenced, a flash powder that has an effective Speed not slower than one-twelfth is sufficiently rapid for portraiture.
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Whilst the greatest effort has been made to ensure the quality of this text, due to the historical nature of this content, in some rare cases there may be minor issues with legibility. Since the wink or reflex action does not occur until one-twelfth of a second after the flash has. Commenced, a flash powder that has an effective Speed not slower than one-twelfth is sufficiently rapid for portraiture.