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| aperture number; f-number (a measure of the light-gathering power of the aperture; the ratio of the focal length to the diameter of the largest entering parallel beam that can pass through the lens) | |||
| stop number | |||
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| |||
| aperture number; f-number (a measure of the light-gathering power of the aperture; the ratio of the focal length to the diameter of the largest entering parallel beam that can pass through the lens) | |||
| stop number | |||