Assertion: lens | /r/CapableOf | offer preset aperture control
Facets:
value: with some earlier cameras
type: OTHER
value: by means of a pushbutton
type: MANNER
Source sentences:
text: With some earlier cameras, the lenses offer preset aperture control by means of a pushbutton that controls the electromagnetic diaphragm; with other earlier cameras, no aperture control is provided, and the lenses are not usable.