| 摘要 |
A fast wide - angle lens after the first embodiment comprises aligned along the optical axis from the subject to an image the first lens component, an aperture diaphragm and the second lens component. The first lens component comprises four lens components, with the third of which having one nonspherical surface. The second lens component comprises seven optical components with the sixth and the seventh of which having one of the surfaces being nonspherical. Fast wide - angle lenses after the second and third embodiments comprise aligned along the optical axis from the subject to an image the first lens component, an aperture diaphragm and the second lens component. The first lens component comprises four lens components, with the fourth of which having one nonspherical surface. The second lens component comprises seven optical components with the sixth and the seventh of which having one of the surfaces being nonspherical. The technical object of the present invention is to provide higher brightness at the edge of the image in relation to that in the center, larger relative aperture, higher coefficient module of the lineal magnification, shorter distance from the subject to an image including the lens. |
