Assertion: lens's aperture | /r/HasProperty | constant
Facets:
value: for all focal lengths
type: OTHER
Source sentences:
text: The maximum aperture of a lens is constant.
text: The maximum aperture for a zoom lens may be the same (constant) for all focal lengths, but it is more common that the maximum aperture is greater at the wide-angle end than at the telephoto end of the zoom range.