Projection objective having large numerical aperture and high magnification

Claim 1

AN IMAGE FORMING OPTICAL PROJECTION SYSTEM OF THE REVERSED TELEPHOTO TYPE WORKING AT FINITE CONJUGATES AND HAVING A HIGH MAGNIFICATION AND NUMERICAL APERTURE OF SUBSTANTIALLY 115X AND .33 RESPECTIVELY AND A TOTAL USEFUL FIELD ANGLE AT LEAST AS GREAT AS 23* ALONG WITH AN EXCELLENT HIGH RESOLUTION AND VERY FLAT FIELD OVER THE ENTIRE FORMAT, SAID SYSTEM HAVING A COLLECTIVE FRONT LENS GROUP OPTICALLY ALIGNED WITH A REAR DISPERSIVE GROUP, SAID COLLECTIVE GROUP INCLUDING: A PLANE PARALLEL COVER GLASS LYING SUBSTANTIALLY IN CONTACT WITH AN OBJECT TO BE PROJECTED AND DESIGNATED I, A POSITIVE MENISCUS LENS MEMBER DESIGNATED II AND HAVING A CONCAVE SURFACE FACING SAID OBJECT AND BEING SPACED AT AN EXIAL DISTANCE S1 THEREFROM, SAID MEMBER INCLUDING A DOUBLE CONCAVE LENS MEMBER DESIGNATED IIA WHICH LIES IN CONTACT WITH A REAR DOUBLE CONVEX LENS MEMBER DESIGNATED IIB, A DOUBLE CONVEX SINGLET LENS MEMBER SPACED REARWARDLY THEREFROM BY AN AXIAL DISTANCE DESIGNATED S2, SAID SINGLET BEING DESIGNATED III, A DOUBLE CONCAVE COMPOUND LENS MEMBER DESIGNATED IV SPACED REARWARDLY OF LENS MEMBER III BY AN AXIAL DISTANCE DESIGNATED S3, SAID MEMBER IV INCLUDING A FRON POSITIVE MENISCUS LENS ELEMENT DESIGNATED IVA WHICH LIES IN CONTACT WITH A REAR DOUBLE CONCAVE LENS ELEMENT IVB, A POSITIVE MENISCUS LENS MEMBER DESIGNATED V HAVING A CONCAVE SURFACE FACING LENS MEMBER IV AND SPACED THEREFROM BY AN AXIAL DISTANCE DESIGNATED S4, A DOUBLE CONVEX LENS MEMBER DISIGNATED VI SPACED REARWARDLY OF LENS V AT AN AXIAL DISTANCE DESIGNATED S5, A NEGATIVE LENS MEMBER DESIGNATED VII AND HAVING A CONCAVE SURFACE FACING LENS MEMBER VI AND SPACED THEREFROM AT A VERY LARGE AXIAL DISTANCE DESIGNATED S6, AND A REARMOST DOUBLE CONVEX SINGLET LENS MEMBER DESIGNATED VIII WHICH IS SPACED AT AN AXIAL DISTANCE DESIGNATED S7 FROM LENS VII AND AT AN AXIAL PROJECTION DISTANCE OF S8 FROM THE IMAGE PRODUCED BY SAID SYSTEM. THE VALUES OF THE EQUIVALENT FOCAL LENGTHS F1 TO FVIII RESPECTIVELY OF THE SUCCESSIVE LENS MEMBERS I TO VIII BEING GIVEN SUBSTANTIALLY IN THE TABLE HEREBELOW IN TERMS OF F WHICH REPRESENTS THE EQUIVALENT FOCAL LENGTH OF SAID SYSTEM, WHEREIN THE MINUS (-) SIGN INDICATES NEGATIVE FOCAL LENGTH,