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repetition number in this series | 0 | memorised on | scheduled repetition | ||||

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tio in telescopes 6 Working f-number 7 History 7.1 Origins of relative aperture 7.2 Aperture numbering systems 7.3 Typographical standardization 8 See also 9 References 10 External links Notation[edit] The f-number N is given by: <span>where is the focal length, and is the diameter of the entrance pupil (effective aperture). It is customary to write f-numbers preceded by f/, which forms a mathematical expression of the entrance pupil diameter in terms of f and N. [2] For example, if a lens's focal length is

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, miosis). DOF formulas[edit] The basis of these formulas is given in the section Derivation of the DOF formulae; [10] refer to the diagram in that section for illustration of the quantities discussed below. Hyperfocal distance[edit] <span>Let be the lens focal length, be the lens f -number, and be the circle of confusion for a given image format. The hyperfocal distance is given by Moderate-to-large distances[edit] Let be the distance at which the camera is focused (the "subject distance"). When is large in comparison with the lens focal length, the d

status | not learned | measured difficulty | 37% [default] | last interval [days] | |||
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repetition number in this series | 0 | memorised on | scheduled repetition | ||||

scheduled repetition interval | last repetition or drill |

, miosis). DOF formulas[edit] The basis of these formulas is given in the section Derivation of the DOF formulae; [10] refer to the diagram in that section for illustration of the quantities discussed below. Hyperfocal distance[edit] <span>Let be the lens focal length, be the lens f -number, and be the circle of confusion for a given image format. The hyperfocal distance is given by Moderate-to-large distances[edit] Let be the distance at which the camera is focused (the "subject distance"). When is large in comparison with the lens focal length, the d

status | not read | reprioritisations | ||
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last reprioritisation on | reading queue position [%] | |||

started reading on | finished reading on |

ities discussed below. Hyperfocal distance[edit] Let be the lens focal length, be the lens f -number, and be the circle of confusion for a given image format. The hyperfocal distance is given by Moderate-to-large distances[edit] <span>Let be the distance at which the camera is focused (the "subject distance"). When is large in comparison with the lens focal length, the distance from the camera to the near limit of DOF and the distance from the camera to the far limit of DOF are and The depth of field is Substituting for and rearranging, DOF can be expressed as Thus, for a given image format, depth of field is determined by three factors: the focal length of the lens, the f -number

status | not learned | measured difficulty | 37% [default] | last interval [days] | |||
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repetition number in this series | 0 | memorised on | scheduled repetition | ||||

scheduled repetition interval | last repetition or drill |

ities discussed below. Hyperfocal distance[edit] Let be the lens focal length, be the lens f -number, and be the circle of confusion for a given image format. The hyperfocal distance is given by Moderate-to-large distances[edit] <span>Let be the distance at which the camera is focused (the "subject distance"). When is large in comparison with the lens focal length, the distance from the camera to the near limit of DOF and the distance from the camera to the far limit of DOF are and The depth of field is Substituting for and rearranging, DOF can be expressed as Thus, for a given image format, depth of field is determined by three factors: the focal length of the lens, the f -number

status | not learned | measured difficulty | 37% [default] | last interval [days] | |||
---|---|---|---|---|---|---|---|

repetition number in this series | 0 | memorised on | scheduled repetition | ||||

scheduled repetition interval | last repetition or drill |

ities discussed below. Hyperfocal distance[edit] Let be the lens focal length, be the lens f -number, and be the circle of confusion for a given image format. The hyperfocal distance is given by Moderate-to-large distances[edit] <span>Let be the distance at which the camera is focused (the "subject distance"). When is large in comparison with the lens focal length, the distance from the camera to the near limit of DOF and the distance from the camera to the far limit of DOF are and The depth of field is Substituting for and rearranging, DOF can be expressed as Thus, for a given image format, depth of field is determined by three factors: the focal length of the lens, the f -number

status | not learned | measured difficulty | 37% [default] | last interval [days] | |||
---|---|---|---|---|---|---|---|

repetition number in this series | 0 | memorised on | scheduled repetition | ||||

scheduled repetition interval | last repetition or drill |

ities discussed below. Hyperfocal distance[edit] Let be the lens focal length, be the lens f -number, and be the circle of confusion for a given image format. The hyperfocal distance is given by Moderate-to-large distances[edit] <span>Let be the distance at which the camera is focused (the "subject distance"). When is large in comparison with the lens focal length, the distance from the camera to the near limit of DOF and the distance from the camera to the far limit of DOF are and The depth of field is Substituting for and rearranging, DOF can be expressed as Thus, for a given image format, depth of field is determined by three factors: the focal length of the lens, the f -number

status | not read | reprioritisations | ||
---|---|---|---|---|

last reprioritisation on | reading queue position [%] | |||

started reading on | finished reading on |

us and f -number from DOF limits. Some view cameras include DOF calculators that indicate focus and f -number without the need for any calculations by the photographer (Tillmanns 1997, 67–68; Ray 2002, 230–31). Hyperfocal distance[edit] <span>The hyperfocal distance is the nearest focus distance at which the DOF extends to infinity; focusing the camera at the hyperfocal distance results in the largest possible depth of field for a given f -number (Ray 2000, 55). Focusing beyond the hyperfocal distance does not in

status | not learned | measured difficulty | 37% [default] | last interval [days] | |||
---|---|---|---|---|---|---|---|

repetition number in this series | 0 | memorised on | scheduled repetition | ||||

scheduled repetition interval | last repetition or drill |

The hyperfocal distance is the nearest focus distance at which the DOF extends to infinity

us and f -number from DOF limits. Some view cameras include DOF calculators that indicate focus and f -number without the need for any calculations by the photographer (Tillmanns 1997, 67–68; Ray 2002, 230–31). Hyperfocal distance[edit] <span>The hyperfocal distance is the nearest focus distance at which the DOF extends to infinity; focusing the camera at the hyperfocal distance results in the largest possible depth of field for a given f -number (Ray 2000, 55). Focusing beyond the hyperfocal distance does not in

status | not learned | measured difficulty | 37% [default] | last interval [days] | |||
---|---|---|---|---|---|---|---|

repetition number in this series | 0 | memorised on | scheduled repetition | ||||

scheduled repetition interval | last repetition or drill |

The hyperfocal distance is the nearest focus distance at which the DOF extends to infinity

us and f -number from DOF limits. Some view cameras include DOF calculators that indicate focus and f -number without the need for any calculations by the photographer (Tillmanns 1997, 67–68; Ray 2002, 230–31). Hyperfocal distance[edit] <span>The hyperfocal distance is the nearest focus distance at which the DOF extends to infinity; focusing the camera at the hyperfocal distance results in the largest possible depth of field for a given f -number (Ray 2000, 55). Focusing beyond the hyperfocal distance does not in