Assertion: camera lens's length | /r/HasProperty | normal
Facets:
value: in cinematography
type: OTHER
Source sentences:
text: For a 35mm camera with a diagonal of 43mm, the most commonly used normal lens is 50mm, but focal lengths between about 40 and 58mm are also considered normal.
text: In cinematography, a focal length roughly equivalent to twice the diagonal of the image projected within the camera is considered normal, since movies are typically viewed from a distance of about twice the screen diagonal.