Varifocal lens system for cameras using leaf type shutters

Claim 1

A VARIFOCAL LENS ASSEMBLY FOR USE WITH CAMERAS EMPLOYING A LEAFT TYPE SHUTTER IMMEDIATELY BEHIND THE LENS COMPRISING IN THE ORDER OF THE ENTRANT LIGHT BEAM, A VARIATOR LENS GROUP OF SPACED NEGATIVE LENSES ENCLOSING TWO AIR LENSES, AN ERECTOR LENS GROUP OF SPACED FIXED POSITIVE LENSES ENCLOSING TWO BI-CONCAVE AIR LENSES, A COMPENSATOR LENS GROUP OF SPACED LENSES OF NEGATIVE POWER THE LAST TWO ELEMENTS OF WHICH ENCLOSE AN AIR LENS, SAID VARIATOR LENS GROUP AN COMPENSATOR LENS GROUP BEIGN LINKED TOGETHER IN FIXED SPACED RELATIONSHIP AND AXIALLY SLIDABLE WITH RESPECT TO THE ERECTOR LENS GROUP, AND A RELAY CONSISTING OF A TELEPHOTO SYSTEM PRECEDED BY A COLLIMATING LENS GROUP CONSISTING OF A BI-CONVEX POSITIVE ELEMENT FOLLOWED BY A NEGATIVE MENISCUS, SAID COLLIMATING LENS GROUP ENCLOSING AN AIR LENS OF NEGATIVE POWER AND IN WHICH THE ELEMENTS HAVE THE FOLLOWING OPTICAL CHARACTERISTICS WHEREIN ND IS THE REFRACTIVE INDEX FOR THE D LINE, V IS ABBE''S DISPERSION NUMBER, LAF STANDS FOR LANTHANUM FLINT, LAK STANDS FOR LANTHANUM CROWN, SF STANDS FOR DENSE FLINT, LASF STANDS FOR DENSE LANTHANUM FLINT, BK STANDS FOR BOROSILICATE CROWN, SK STANDS FOR DENSE CROWN: