Dual macro zoom optical system

Claim 2

A variable focal length optical system which is focusable within a normal range defined at one end by a normal telephoto condition and at the other end by a normal wide angle condition, and being continuously focusable refractively by repositioning of internal lens elements within a first macro range defined at one end by a macro wide angle condition and at the other end by the normal wide angle condition, and being continuously focusable refractively by repositioning of internal lens elements within a second macro range defined at one end by a macro telephoto condition and at the other end by the normal telephoto condition, said optical system comprising focusing lens means for focusing said optical system on an object located within the normal range, a zoom lens assembly including variator lens means, compensator lens means and a camming sleeve having a variator camming slot and a compensator camming slot, said variator lens means and said compensator lens means being located in said camming sleeve and being mutually displaceable therein in a predetermined relationship for varying the focal length of said optical system, and collimator lens means for collimating rays from said compensator lens means and occupying a fixed position in said optical system irrespective of the focal length thereof, said variator lens means and said compensator means occupying predetermined positions corresponding to the various conditions of said optical system and which maintain the object distances finite throughout the range of said positions, said variator lens means including a variator holder, a variator lens group mounted therein, and a variator pin protruding therefrom and into said variator slot, said variator slot having first and second end portions and a middle portion therebetween respectively corresponding to the first macro range, the axis of said second end portion of said variator slot lying substantially in a plane, the second macro range, and the normal range, said compensator lens means including a compensator holder, a compensator lens group mounted therein, and a compensator pin protruding therefrom and into said compensator slot, said compensator slot having first and second end portions and a middle portion therebetween respectively corresponding to the first macro range and the second macro range and the normal range, the axis of said second end of portion of said compensator slot lying substantially in a plane, to permit continuous macro focusing at either end of the zoom range without extending the optical system beyond its normal focusing range length.

Claim 3

The optical system set forth in claim 1, wherein the axis of said first end portion of said variator slot lies substantially in a plane.

Claim 4

The optical system set forth in claim 2, wherein the axis of said middle portion of said variator slot lies substantially in a plane.

Claim 5

The optical system set forth in claim 1, wherein the arcuate extent of each of said second end portions of said variator slot and said second end portion of said compensator slot is about 58°.

Claim 6

The optical system of claim 1, wherein said middle portion of said compensator slot smoothly and continuously merges into said first end portion.

Claim 7

The optical system set forth in claim 1, wherein the positions of said variator lens means and said compensator lens means are substantially identical at both the first macro telephoto condition and the first macro wide angle condition.

Claim 8

The optical system set forth in claim 1, wherein said variator lens means is located nearer to said focusing lens means in the first macro telephoto condition than in the normal telephoto condition.

Claim 9

The optical system set forth in claim 1, having substantially the following specification: __________________________________________________________________________ SYSTEM EFL HALF ANGLE OF FIELD __________________________________________________________________________ at W/A = 7.04 mm (.2776 in.) 27.81° at T/P = 43.05 mm (1.6949 in.) 4.52° at MID = 22.13 mm (.8319 in.) 8.84° __________________________________________________________________________ LENS RADII (mm.) THICKNESS (mm.) SPACINGS (mm) N.sub.D V __________________________________________________________________________ 1 R.sub.1 = 240.7589 1.755 27.6 T.sub.1 = 1.6510 R.sub.2 = -51.1988 S1 = 0 2 R.sub.3 = 51.1988 T.sub.2 = 12.7000 1.620 60.4 R.sub.4 = 153.6954 S.sub.2 = .1016 3 R.sub.5 = 43.6880 T.sub.3 = 7.7978 1.651 55.9 R.sub.6 = -139.7000 S.sub.3 = see below 4 R.sub.7 = 71.7550 T.sub.4 = .8128 1.639 55.4 R.sub.8 = -16.5100 S.sub.4 = 6.6294 5 R.sub.9 = -24.0030 T.sub. 5 = .8382 1.620 60.4 R.sub.10 = -19.1008 S.sub.5 = 0 6 R.sub.11 = 19.1008 T.sub.6 = 3.5052 1.785 25.8 R.sub.12 = -59.9948 S.sub.6 = see below 7 R.sub.13 = 58.9280 T.sub.7 = .8890 1.805 25.4 R.sub.14 = -21.7424 S.sub.7 = 0 8 R.sub.15 = 21.7424 T.sub.8 = 5.6388 1.641 60.1 R.sub.16 = 30.2260 S.sub.8 = .1016 9 R.sub.17 = 22.7203 T.sub.9 = 3.1496 1.691 54.9 R.sub.18 = -93.1672 S.sub.9 = see below 10 R.sub.19 = -45.5168 T.sub.10 = .7112 1.691 54.9 R.sub.20 = -12.8016 S.sub.10 = 2.2352 11 R.sub.21 = 14.6431 T.sub.11 = 2.0574 1.805 25.4 R.sub.22 = -27.0256 S.sub.11 = 11.0490 STOP---- S.sub.12 = 3.5560 12 R.sub.23 = 18.0848 1.744 44.8 T.sub.12 = 3.6576 R.sub.24 = 32.8168 S.sub.13 = 1.6002 13 R.sub.25 = -21.9202 1.805 25.4 T.sub.13 = .7112 R.sub.26 = -16.8656 S.sub.14 = .7366 14 R.sub.27 = 61.2140 1.805 25.4 T.sub.14 = 4.3180 R.sub.28 = -14.5288 S.sub.15 = 0 15 R.sub.29 = 14.5288 1.744 44.8 T.sub.15 = 3.2512 R.sub.30 = 26.9494 S.sub.16 = .1270 16 R.sub.31 = 14.7320 1.734 51.7 T.sub.16 = 2.5654 R.sub.32 = -463.9259 S.sub.17 = 11.4529 __________________________________________________________________________ Variable Spacings __________________________________________________________________________ S.sub.3 = 1.143 at W/A end of normal range 26.411 at T/P end of normal range 19.252 at middle of normal range 4.699 at one end of macro wide angle range 8.509 at other end of macro wide angle range 5.080 at middle of macro wide angle range 19.812 at one end of macro telephoto range 8.509 at other end of macro telephoto range 18.288 at middle of macro telephoto range S.sub.6 = 38.405 at W/A end of normal range 2.804 at T/P end of normal range 14.256 at middle of normal range 33.8328 at one end of macro wide angle range 23.2918 at other end of macro wide angle range 33.0708 at middle of macro wide angle range 10.541 at one end of macro telephoto range 23.2918 at other end of macro telephoto range 12.2936 at middle of macro telephoto range S.sub.9 = 1.600 at W/A end of normal range 11.933 at T/P end of normal range 7.640 at middle of normal range 2.6162 at one end of macro wide angle range 9.3472 at other end of macro wide angle range 2.9972 at middle of macro wide angle range 10.795 at one end of macro telephoto range 9.3472 at other end of macro telephoto range 10.5664 at middle of macro telephoto range __________________________________________________________________________ wherein the first column lists the lens elements numerically starting at the ray entrance side of the system; the second column lists the respective base radii R 1 to R 32 , using the convention that the negative (-) values of the radii indicating surfaces which are concave and the positive (+) values of the radii indicating surfaces which are covex; the third column lists the thicknesses T 1 -T 16 of the respective elements; the fourth column lists the axial spacings S 1 to S 17 between the respective elements, the spacings between the stop and the adjacent elements, and the spacing between the last element and the image plane; and the fifth and sixth columns respectively list the index of refraction for the Sodium D line N D and the dispersive index V of the optical materials of the respective elements, wherein said focusing lens means consists of the lenses 1 through 3; and said variator lens means consists of the lenses 4 through 6, said compensator lens means consists of the lenses 7 through 9 and said collimator lens means consists of the lenses 10 and 11.