Assertion: camera's aperture | /r/HasProperty | given as the dimensionless ratio
Facets:
value: between that measure
type: OTHER
value: between the focal length
type: OTHER
value: in astrophotography
type: LOCATION
Source sentences:
text: In astrophotography, the aperture may be given as a linear measure (for example in inches or mm) or as the dimensionless ratio between that measure and the focal length.