Property talk:P6790
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Documentation
f-number
ratio of the system's focal length to the diameter of the entrance pupil. Sample: 4 (generally written "Ζ/4") for a lens with 200 mm focal length using an entrance pupil diameter of 50 mm.
ratio of the system's focal length to the diameter of the entrance pupil. Sample: 4 (generally written "Ζ/4") for a lens with 200 mm focal length using an entrance pupil diameter of 50 mm.
Represents | f-number (Q862169) | |||||||||
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Data type | Quantity | |||||||||
Allowed values | 0.1 β€ π§ β€ 1001 β€ π§ β€ 25 | |||||||||
Allowed units | not applicable | |||||||||
Example | DΓΌlmen, North Rhine-Westphalia, Germany (Q34788400) β 13 Afghan Girl (Q19819228) β 2.5 | |||||||||
Commons example |
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See also | ISO speed (P6789), exposure time (P6757), aperture (P7863) | |||||||||
Lists |
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Proposal discussion | Proposal discussion | |||||||||
Current uses |
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Units: βnovalueβ: value unit must be one of listed. (Help)
Exceptions are possible as rare values may exist. Exceptions can be specified using exception to constraint (P2303). List of violations of this constraint: Database reports/Constraint violations/P6790#Units
constraint βsubject type constraint (Q21503250)β declaration error: βrequired qualifier βclass (P2308)β is missingβ.
Range from β0.1β to β100β: values should be in the range from β0.1β to β100β. (Help)
List of violations of this constraint: Database reports/Constraint violations/P6790#Range, hourly updated reportRange from β1β to β25β: values should be in the range from β1β to β25β. (Help)
Exceptions are possible as rare values may exist. Exceptions can be specified using exception to constraint (P2303). List of violations of this constraint: Database reports/Constraint violations/P6790#Range