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並前往https://books.google.com.tw/books?id=8cDoZCjEaR4C&pg=PA647&lpg=PA647&dq=aperture+ratio&source=bl&ots=G9xnJQeNk6&sig=ACfU3U3rDlEWJhDwiVTdi-LVb2pXeduzAw&hl=zh-TW&sa=X&ved=2ahUKEwiXkKztqpX2AhUQzIsBHWuUBnYQ6AF6BQjhAhAD

Journal of Research of the National Bureau of Standards

The dots correspond to the equivalent aperture ratios , each dot representing the ... ratio of the same value as the next smaller geometric aperture ratio .

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