Large aperture lens

The invention relates to a large aperture lens. The large aperture lens comprises: seven lenses arranged in order from the object side to the image side along an optical axis, respectively: a first lens (1), a second lens (2), a third lens (3) a fourth lens (4), a fifth lens (5), a sixth lens (6) and a seventh lens (7), and also includes a diaphragm (S), wherein the diaphragm (S) is located between the second lens (2) and the third lens (3); the first lens (1) and the seventh lens (7) are negative power lenses; the second lens (2) and the sixth lens (6) are positive power lenses; the third lens (3) is a plastic aspherical lens; and the fourth lens (4) and the fifth lens (5) constitute a glued lens group. The large aperture lens has high pixel, and can be used at day and night. 本发明涉及种大光圈镜头，包括：沿光轴从物侧至像侧依次排列的七片透镜，分别为：第透镜(1)、第二透镜(2)、第三透镜(3)、第四透镜(4)、第五透镜(5)、第六透镜(6)和第七透镜(7)；还包括光阑(S)，所述光阑(S)位于所述第二透镜(2)和所述第三透镜(3)之间；所述第透镜(1)和所述第七透镜(7)为负光焦度透镜；所述第二透镜(2)和所述第六透镜(6)为正光焦度透镜；所述第三透镜(3)为塑胶非球面透镜；所述第四透镜(4)和所述第五透镜(5)构成胶合镜片组。根据本发明