Wide-angle camera objective consisting of four air-spaced members

Claim 1

A WIDE-ANGLE OPTICAL OBJECTIVE SYSTEM CONSISTING OF FOUR AIR-SPACED MEMBERS COMPOSED OF A TOTAL OF EIGHT LENSES, SAID MEMBERS BEING A FIRST OUTER DISPERSIVE SINGLET, A FIRST COLLECTIVE TRIPLET SEPARATED BY A NEGATIVELY REFRACTING FORWARD AIR SPACE FROM SAID FIRST SINGLET, A SECOND COLLECTIVE TRIPLET ENCLOSING WITH SAID FIRST TRIPLET A POSITIVELY REFRACTING DIAPHRAGM SPACE, AND A SECOND OUTER DISPERSIVE SINGLET SEPARATED FROM SAID SECOND TRIPLET BY A NEGATIVELY REFRACTING REAR AIR SPACE; SAID DISPERSIVE MEMBERS BEING MENISCUS-SHAPED AND TURNING THEIR MORE STRONGLY CURVED SURFACES TOWARD SAID TRIPLETS, SAID FIRST SINGLET HAVING AN OUTER SURFACE WITH A RADIUS OF CURVATURE EQUAL TO AT LEAST FIVE TIMES THE RADIUS OF ITS INNER SURFACE FOR MINIMIZING SPHERICAL ZONAL ABERRATIONS; EACH OF SAID TRIPLETS BEING COMPOSED OF A BICONVEX POSITIVE LENS SANDWICHED BETWEEN A MENISCUS-SHAPED INNER NEGATIVE LENS ADJACENT SAID DIAPHRAGM SPACE AND A MENISCUSSHAPED OUTER NEGATIVE LENS REMOTE FROM SAID DIAPHRAGM SPACE, THE REFRACTIVE INDICES OF SAID INNER NEGATIVE LENS, SAID POSITIVE LENS AND SAID OUTER NEGATIVE LENS PROGRESSIVELY INCREASING IN MAGNITUDE WITHIN EACH TRIPLET FROM SAID DIAPHRAGM SPACE OUTWARDLY FOR CORRECTION COMA AT LARGE APERTURE RATIOS, THE REFRACTIVE INDEX OF SAID OUTER NEGATIVE LENS EXCEEDING THAT OF SAID INNER NEGATIVE LENS BY A MINIMUM OF SUBSTANTIALLY 0.12 UNITS AND THAT OF SAID POSITIVE LENS BY A MINIMUM OF SUBSTANTIALLY 0.08 UNITS WITHIN EACH TRIPLET, SAID INNER NEGATIVE LENSES HAVING CONFRONTING CONVEX SURFACES FOR SUPPRESSING FIELD CURVATURE AND ASTIGMATISM.