Three member microscope objective

Claim 1

AN ACHROMATIC OBJECTIVE FOR A MICROSCOPE AND THE LIKE HAVING A MAGNIFICATION OF SUBSTANTIALLY 30X AND A MINIMUM APERTURE OF SUBSTANTIALLY 0.65, SAID OBJECTIVE FORMING AN IMAGE OF AN OBJECT SURFACE, THE IMAGE BEING WELL CORRECTED FOR SPHERICAL AND CHROMATIC ABERRATIONS, COMA, AND ASTIGMATISM, SAID OBJECTIVE FURTHERMORE FORMING AN EXIT PUPIL SUBSTANTIALLY IN THE PLANE OF THE VERTEX OF THE REARMOST LENS SURFACE OF SAID OBJECTIVE, SAID OBJECTIVE BEING COMPOSED OF A FRONT SINGLET LENS MEMBER, AND A SECOND AND A THIRD LENS MEMBER WHICH ARE COMPOUND, SAID MEMBERS ALL BEING OPTICALLY ALIGNED WITH AND SPACED FROM EACH OTHER, SAID FRONT LENS MEMBER BEING NOMINALLY A PLANO-CONVEX FORM DESIGNATED I, SAID SECOND LENS MEMBER BEING COMPOSED OF A FRONT PLANO-CONCAVE LENS ELEMENT II AND A DOUBLE CONVEX LENS ELEMENT III, AND SAID THIRD LENS MEMBER BEING FORMED OF A FRONT NEGATIVE MENISCUS LENS ELEMENT IV WHICH LIES IN CONTACT WITH A REAR DOUBLE CONVEX LENS ELEMENT V, THE VALUES OF THE RADII R1 TO R2 OF THE SUCCESSIVE LENS SURFACES, THE VALUES OF THE AXIAL THICKNESSES T1 TO T5 OF THE SUCCESSIVE LENS ELEMENTS I TO V, THE VALUES FOR THE AIRSPACES S1 TO S4 BETWEEN SAID OBJECT SURFACE AND SAID IMAGE BEING GIVEN IN THE TABLE OF MATHEMATICAL STATEMENTS HEREBELOW WHEREIN THE MINUS (-) SIGNS USED WITH THE R VALUES APPLIES TO THOSE LENS SURFACES WHOSE CENTERS OF CURVATURE LIE ON THE ENTRANT SIDE OF THE VERTEX OF SAID SURFACES, AND F DENOTES THE EQUIVALENT FOCAL LENGTH OF SAID OBJECTIVE,