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About: Lens speed     Goto   Sponge   NotDistinct   Permalink

An Entity of Type : yago:Whole100003553, within Data Space : dbpedia.org associated with source document(s)

Type: yago:WikicatTelescopesyago:Artifact100021939yago:Device103183080yago:Instrument103574816yago:Instrumentality103575240yago:Magnifier103709206yago:Object100002684yago:PhysicalEntity100001930yago:ScientificInstrument104147495yago:Telescope104403638yago:Whole100003553 New Facet based on Instances of this Class

Lens speed refers to the maximum aperture diameter, or minimum f-number, of a photographic lens. A lens with a larger than average maximum aperture (that is, a smaller minimum f-number) is called a "fast lens" because it can achieve the same exposure as an average lens with a faster shutter speed. Conversely, a smaller maximum aperture (larger minimum f-number) is "slow" because it delivers less light intensity and requires a slower (longer) shutter speed.