Assertion: camera lens's length | /r/HasProperty | measured
Facets:
value: easily
type: MANNER
value: from the rear nodal point
type: OTHER
value: by using it
type: MANNER
value: in millimeters
type: OTHER
value: from the sensor
type: OTHER
Source sentences:
text: Effective focal length is measured from the sensor to where the light cone going to the sensor is the same size as the lens front opening.
text: Focal length is the measurement (in millimeters) from the optical center of a camera lens to the camera’s sensor.
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: 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.
text: The focal length of a thin convex lens can be easily measured by using it to form an image of a distant light source on a screen.