Assertion: diaphragm's opening | /r/CapableOf | allow light
Facets:
value: to cover the entire image
type: PURPOSE
Source sentences:
text: A central shutter is not a type of shutter as such, but describes the position of the shutter: it is typically a leaf shutter (or simple leaf shutter), and located within the lens assembly where a relatively small opening allows light to cover the entire image.