f-number

Noun

Meaning

the ratio of the focal length to the diameter of a (camera) lens system

Alternative names

f number

Synonyms

Hypernyms

Examples

DOF is determined by subject magnification at the film / sensor plane and the selected lens aperture or f-number. Source: Internet

For a given f-number, increasing the magnification, either by moving closer to the subject or using a lens of greater focal length, decreases the DOF; decreasing magnification increases DOF. Source: Internet

For a given DOF and field of view, the required f-number is proportional to the format size. Source: Internet

Couzin (1982) gave a formula essentially the same as Hansma's for optimal f-number, but did not discuss its derivation. Source: Internet

Equivalent aperture range seeAlso In digital photography, the 35mm-equivalent aperture range is sometimes considered to be more important than the actual f-number. Source: Internet

For a given subject magnification, increasing the f-number (decreasing the aperture diameter) increases the DOF; decreasing f-number decreases DOF. Source: Internet

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