Assertion: camera lens's length | /r/HasProperty | ffl
Facets:
Source sentences:
text: The distance from the front focal point of the combined lenses to the first lens is called the front focal length (FFL):
text: For a thick lens (one which has a non-negligible thickness), or an imaging system consisting of several lenses or mirrors (e.g. a photographic lens or a telescope), the focal length is often called the effective focal length (EFL), to distinguish it from other commonly used parameters:
text: A zoom lens is a mechanical assembly of lens elements for which the focal length (and thus angle of view) can be varied, as opposed to a fixed focal length (FFL) lens (see prime lens).
text: Front focal length (FFL) or front focal distance (FFD) (