Metallurgical optical semi-objective of 8.0x magnification

Claim 1

A MICROSCOPE SEMI-OBJECTIVE HAVING A COMBINED POSITIVE POWER OF 40X AND A NUMERICAL APERTURE OF 0.65 WHEN USED WITH A REARWARDLY ALIGNED CORRECTOR LENS OF 5X MAGNIFICATION, SAID SEMI-OBJECTIVE COMPRISING A FRONT SINGLET LENS MEMBER DESIGNATED I OF POSITIVE MENISCUS FORM WHICH IS CONCAVE TOWARD AN OBJECT SURFACE ON WHICH SAID SEMI-OBJECTIVE IS FOCUSED, MEMBER I BEING SPACED AN AXIAL DISTANCE DESIGNATED S1 FROM SAID SURFACE AND HAVING AN AXIAL THICKNESS DESIGNATED T1, A SECOND SINGLET LENS MEMBER DESIGNATED II OF POSITIVE MENISCUS FORM WHICH IS CONCAVE TOWARD THE FRONT, MEMBER II BEING SPACED AT AN AXIAL DISTANCE DESIGNATED S2 REARWARDLY FROM MEMBER I AND HAVING AN AXIAL THICKNESS DESIGNATED T2, A FRONT DOUBLET LENS MEMBER DESIGNATED III WHICH IS SPACED AT AN AXIAL DISTANCE DENOTED S3 REARWARDLY OF MEMBER II, SAID MEMBER INCLUDING A FRONT CONVEXCONCAVE LENS ELEMENT DESIGNATED IIIA WHICH JOINS ALONG AN INTERFACE A REAR DOUBLE CONVEX LENS ELEMENT DESIGNATED IIIB, THE AXIAL THICKNESS OF SAID ELEMENTS BEING DESIGNATED T3 AND T4 RESPECTIVELY, A REAR DOUBLET LENS MEMBER DESIGNATED IV WHICH IS SPACED AT AN AXIAL DISTANCE DENOTED S4 REARWARDLY OF MEMBER III, SAID MEMBER INCLUDING A FRONT CONVEXCONCAVE LENS ELEMENT DESIGNATED IVA WHICH JOINS ALONG AN INTERFACE A REAR DOUBLE CONVEX LENS ELEMENT DESIGNATED IVB, THE AXIAL THICKNESSES OF SAID ELEMENTS BEING DESIGNATED T5 AND T6 RESPECTIVELY, THE VALUES FOR THE LENS PARAMETERS CONSTITUTING SAID SEMI-OBJECTIVE BEING GIVEN IN THE TABLE OF MATHEMATICAL STATEMENTS HEREBELOW WHEREIN FI TO FIV REPRESENTS THE EQUIVALENT FOCAL LENGTHS OF THE SUCCESSIVE LENS MEMBERS I TO IV RESPECTIVELY, AND FURTHER IN-