Four component optical objective

Claim 1

AN OPTICAL OBJECTIVE CORRECTED FOR SPHERICAL AND CHROMATIC ABERRATIONS, COMA, ASTIGMATISM, FIELD CURVATURE AND DISTORTION, AND COMPRISING A DIAPHRAGM, TWO COMPOUND DIVERGENT MENISCUS COMPONENTS DISPOSED ONE ON EACH SIDE OF THE DIAPHRAGM WITH THEIR EXTERNAL FACES CONCAVE THERETO AND EACH CONSISTING OF A CONVERGENT ELEMENT AND A DIVERGENT ELEMENT, A SIMPLE CONVERGENT FRONT COMPONENT LOCATED IN FRONT OF THE DIVERGENT COMPONENTS, SUCH FRONT COMPONENT AND ALSO THE CONVERGENT ELEMENTS OF THE TWO DIVERGENT COMPONENTS BEING MADE OF CRYSTALLINE FLUORITE, AND A CONVERGENT REAR COMPONENT LOCATED BEHIND THE DIVERGENT COMPONENTS AND IN THE FORM OF A COMENTED DOUBLE WHOSE CEMENTED SURFACE IS COLLECTIVE AND CONVEX TOWARDS THE DIAPHRAGM, SUCH REAR COMPONENT CONSISTING OF A DIVERGENT, ELEMENT MADE OF A MATERIAL HAVING MEAN REFRACTIVE INDEX BETWEEN 1.55 AND 1.60 AND A CONVERGENT ELEMENT MADE OF A MATERIAL HAVING MEANS REFRACTIVE INDEX GREATER THAN 1.65 AND AT LEAST 06 GREATER THAN THAT OF THE ASSOCIATED DIVERGENT ELEMENT, THE POWER OF THE COLLECTIVE CEMENTED SURFACE IN THE REAR COMPONENT LYING BETWEEN .3 AND .4 TIMES THE EQUIVALENT POWER OF THE OBJECTIVE.