Continuously variable anamorphic lens

Claim 2

A continuously variable anamorphic lens comprising: a four element front lens group for collimating light, a four element rear lens group for decollimating light, a pair of achromatized prisms between said front and rear groups, said prisms being pivotable about parallel axes perpendicular to the axis of the lens, and means for pivoting said prisms in a predetermined relationship, said front and rear lens groups cooperating with said prisms to provide a primary magnification of from 0.8 to 1.2 and a continuously variable anamorphic magnification of from 0.9 to 1.0.

Claim 3

The lens of claim 1 wherein the elements of said front lens group are from front to rear a double convex lens element cemented to a double concave lens element, a concave meniscus lens element and a convex meniscus and wherein the elements of said rear lens group are from front to rear a convex meniscus lens element, a concave meniscus lens element and a double concave lens element cemented to a double convex lens element.

Claim 4

The lens of claim 2 wherein the lens elements have substantially the following characteristics and spatial relations in which the lens elements are numbered from front to rear, N d is the index of refraction of the lens elements for the Sodium d line, V is the index of dispersion, and R, t and s refer, respectively to the radii of curvature of the lens surfaces, the axial thickness of the lens elements and the air spaces between the elements, numbered by subscript from front to rear, the plus and minus values of the radii, R, denoting surfaces that are, respectively, convex and concave: ______________________________________ ELEMENT THICKNESSES & NO N.sub.d V RADII (m.m.) SPACINGS (m.m.) ______________________________________ 1 1.589 61.27 R.sub.1 =+96.000 t.sub.1 =22.66 R.sub.2 =+301.000 2 1.548 45.75 R.sub.3 =-301.000 t.sub.2 =5.80 R.sub.4 =-90.900 s.sub.1 =7.39 3 1.740 28.20 R.sub.5 =+145.812 t.sub.3 =4.50 R.sub.6 =-58.250 s.sub.2 =1.39 4 1.755 27.58 R.sub.7 =+61.303 t.sub.4 =6.50 R.sub.8 =-166.300 s.sub.3 =7.94 5 1.589 61.27 R.sub.9 = ∝ t.sub.5 =6.60 R.sub.10 = ∝ 6 1.620 36.37 R.sub.11 = ∝ t.sub.6 =4.10 R.sub.12 = ∝ s.sub.4 =6.20 STOP (At surface 12) 7 1.620 36.37 R.sub.13 = ∝ t.sub.7 =5.44 R.sub.14 = ∝ 8 1.589 61.27 R.sub.15 = ∝ t.sub.8 =8.60 R.sub.16 = ∝ s.sub.5 =6.38 9 1.755 27.58 R.sub.17 =-166.30 t.sub.9 =6.50 R.sub.18 =+61.303 s.sub.6 =1.39 10 1.740 28.20 R.sub.19 =-58.250 t.sub.10 =4.50 R.sub.20 =+145.812 s.sub.7 =7.39 11 1.548 45.75 R.sub.21 =-90.900 t.sub.11 =5.80 R.sub.22 =-301.000 12 1.589 61.27 R.sub.23 =+301.000 t.sub.12 =22.66 R.sub.24 =+96.000 ______________________________________