Assertion: lens's aperture | /r/HasProperty | measured in f-stops
Facets:
value: for photography
type: PURPOSE
Source sentences:
text: The shutter speed is measured in seconds or fractions of a second while aperture is measured in f-stops.
text: The aperture is measured in f-stops, and the number of each f-stop corresponds to the focal length of the lens divided by the diameter of the aperture.
text: For photography, aperture is measured in f-stops.