The @graph contains labels for the properties and values of the core RDF resource defined @id.
the ratio of the focal length to the diameter of a (camera) lens system
type
is in mapping relation with
definition
has close match
forbundet begreb
linked concept
has exact match
is in semantic relation with
Source
bemærkning
note
{f number; focal ratio; stop number}
{f number; focal ratio; speed; stop number}