Ultra-wide-angle lens including six lenses of --++-+ refractive powers, or seven lenses of --++-++ or ---+-++ refractive powers

This is an ultra-wide-angle lens designed for compact devices, built from either six or seven individual lenses. It arranges these lenses into four distinct groups: a front negative group, followed by a positive group made of two specific lenses, then a stop, a third group where two lenses are permanently bonded together, and finally a positive rear group. This specific arrangement aims to achieve a wide field of view.