Photographic lenses primarily utilizing light of shorter wavelengths

Claim 1

A photographic lens assembly comprising first lens means including a positive meniscus lens convex on the side facing an object and having faces with respective radii R1 and R2; second lens means including a positive lens and a negative lens joined together to form a forward face, an interface, and a rear face with respective radii R3, R4 and R5; third lens means including a positive meniscus lens and a companion lens joined together to form a forward face, a second interface, and a rear face with respective radii R6, R7 and R8, said third lens means being concave as a whole on the side facing an object; and fourth lens means including a lens convex on both surfaces thereof and having respective radii R9 and R10, said lens means being coaxially aligned along an optical axis, said lenses having respective faces spaced from each other by distances D1...D9 respectively along the optical axis from the lens from said first lens means to the lens of said fourth lens means, the material of said lenses from said first lens means to said fourth lens means having respective refractive indices N1...N6 with respect to light having a wavelength 385 m Mu , said lenses in said first lens means through said fourth lens means having lens materials with respective Abbe''s numbers V1...V6, said assembly having an overall focal length of one, said assembly having an overall aperture ratio F/1.8, said lenses meeting the following conditions: f 1 F 1.8, 2 omega 25* R1 0.79630 D1 0.11655 N1 1.66145 V1 60.2 R2 4.7493 D2 0.00667 R3 0.40756 D3 0.15771 N2 1.66145 V2 60.2 R4 0.80141 D4 0.04627 N3 1.67605 V3 35.3 R5 0.27571 D5 0.24781 R6 -0.32208 D6 0.05284 N4 1.69025 V4 33.8 R7 -3.4037 D7 0.12607 N5 1.76603 V5 53.5 R8 -0.46386 D8 0.00667 R9 1.3658 D9 0.14961 N6 1.76603 V6 53.5 R10 -1.4862