Assertion: lens's aperture ring | /r/HasAspect | a green
Facets:
value: to indicate automatic aperture operation
type: PURPOSE
value: at the end of the scale
type: LOCATION
Source sentences:
text: This first series of FD lenses shared other characteristics that would later change; the breech-lock ring can be rotated freely without mounting it on a camera body, and the aperture ring had a green "o" at the end of the scale to indicate automatic aperture operation, which at the time was only possible with an F-1 body that had the Servo EE Finder attached.