Assertion: camera's lense | /r/HasProperty | lense
Facets:
Source sentences:
text: In this simple optically compensated zoom lens, the afocal system consists of two positive (converging) lenses of equal focal length (lenses L 1 and L 3 ) with a negative (diverging) lens (L 2 ) between them, with an absolute focal length less than half that of the positive lenses.