Photographic or cinematographic high-speed teleobjective

Claim 1

AN OPTICAL TELEOBJECTIVE SYSTEM COMPRISING A FOURMEMBER FRONT LENS GROUP AND A SINGLE COLLECTIVE REAR LENS MEMBER SEPARATED THEREFROM BY A DIAPHRAGM SPACE, SAID FRONT LENS GROUP CONSISTING OF THREE CLOSELY SPACED POSITIVE LENS MEMBERS AND A NEGATIVE FOURTH LENS MEMBER FOLLOWING SAID POSITIVE LENS MEMBERS WITH A RELATIVELY LARGE AIR SPACE, THE RATIO OF SAID RELATIVELY LARGE AIR SPACE TO SAID DIAPHRAGM SPACE BEING SUBSTANTIALLY 1:2, THE SUM OF SAID RELATIVELY LARGE AIR SPACE AND SAID DIAPHRAGM SPACE AMOUNTING TO AT LEAST 28% OF THE OVERALL FOCAL LENGTH OF THE SYSTEM, THE THIRD OF SAID POSITIVE LENS MEMBERS BEING A DOUBLET COMPOSED OF A POSITIVELY AND A NEGATIVELY REFRACTING LENS CEMENTED TOGETHER ALONG A SURFACE WHOSE REFRACTIVE POWER FOR THE E LINE OF THE SPECTRUM RANGES SUBSTANTIALLY BETWEEN THE LIMITS OF -0.03 AND +0.04, THE ABBE NUMBERS OF SAID POSITIVELY AND NEGATIVELY REFRACTING LENSES DIFFERING BY A VALUE GREATER THAN 20, THE SUM OF THE DISTANCE FROM THE FRONT VERTEX OF THE FIRST POSITIVE LENS MEMBER TO THE REAR VERTEX OF SAID REAR LENS MEMBER PLUS THE BACK-FOCAL LENGTH OF THE SYSTEM BEING SUBSTANTIALLY EQUAL TO THE OVERALL FOCAL LENGTH OF THE SYSTEM, THE FIRST TWO OF SAID POSITIVE LENS MEMBERS HAVING REFRACTIVE INDICES OF A VALUE LESS THAN 1:55 FOR THE E LINE OF THE SPECTRUM, SAID COLLECTIVE REAR LENS MEMBER BEING A DOUBLET COMPOSED OF A COLLECTIVE AND A DISPERSIVE LENS CEMENTED TOGETHER ALONG A SURFACE WHOSE RADIUS IS LESS THAN 0.3 TIMES SAID OVERALL FOCAL LENGTH, THE REFRACTIVE INDICES OF SAID COLLECTIVE AND DISPERSIVE LENSES FOR THE E LINE OF THE SPECTRUM DIFFERING BY A VALUE RANGING BETWEEN SUBSTANTIALLY 0.02 AND 0.07.