PHOTOGRAPHIC WIDE-ANGLE LENS

A wide-angle lens according to the invention comprises, in order from a lens-side to an image-side end, a front group with a positive total refractive power having at least four lenses, a central group with a positive total refractive power having at least three lenses, and a rear group with a positive total refractive power having at least three lenses, wherein the ratio between the focal length of the front group and the total focal length of the lens is between 2.28 and 2.79, the ratio between the focal length of the central group and the total focal length of the lens is between 3.02 and 3.69, and the ratio between the focal length of the rear group and the total focal length of the lens is between 3.50 and 4.29. 根据本发明的广角镜头包括按照从透镜侧到图像侧末端的顺序的：具有至少四个透镜的总屈光力为正的前组；具有至少三个透镜的总屈光力为正的中心组；以及具有至少三个透镜的总屈光力为正的后组，其中，前组的焦距和镜头的总焦距之比在2.28和2.79之间，中心组的焦距和镜头的总焦距之比在3.02和3.69之间，以及后组的焦距和镜头的总焦距之比在3.50和4.29之间。