ANAMORPHIC OBJECTIVE ZOOM LENS

摘要

The anamorphic objective zoom lens includes, along an optical axis and in order from an object space to an image space: at least a negative (−) power spherical first lens group; an anamorphic lens group, spherical second lens group preferably having positive (+) power, a variable power spherical third lens group and a positive (+) power spherical fourth lens group. The aperture stop is located before, after or preferably within the spherical fourth lens group. All spherical lens groups contain spherical and plano refractive optical surfaces. The anamorphic lens group contains cylindrical and plano optical surfaces with at least one cylindrical surface oriented at substantially 90 degrees about at least one other cylindrical surface. The spherical first lens group may provide focusing. The variable power spherical third lens group provides zooming.

主权项

1. An anamorphic objective zoom lens comprising along an optical axis and in order from an object space to an image space: a negative (−) power spherical first lens group; an anamorphic lens group; a spherical second lens group, a zoom lens group, a positive (+) power spherical third lens group and an aperture stop; wherein said aperture stop is located in a position selected from one of the following locations: before, after and within said spherical third lens group.