Assertion: eyepiece's length | /r/HasProperty | stated in millimeter
Facets:
value: always
type: TEMPORAL
Source sentences:
text: The focal length of an eyepiece is stated in millimeters and determines the magnification that eyepiece provides with any particular telescope.
text: The focal length ( EFL ) of the eyepiece is measured from the eyepiece focal plane to the eyepiece principal plane, and is always stated in millimeters.