Assertion: telephoto lens's length | /r/HasProperty | measured
Facets:
value: in millimeters
type: OTHER
value: from the rear nodal point
type: OTHER
Source sentences:
text: Instead, focal length is measured from the rear nodal point—which, along with the focal point, is one of the cardinal points in Gaussian optics—to the focal point while the lens is focused at infinity.
text: Focal length is the measurement (in millimeters) from the optical center of a camera lens to the camera’s sensor.
text: You really don’t need a very deep understanding of how focal length is measured to take good photos; you just need to know what it means for your photos.