A finite conjugate lens assembly with modular interchangeable components includes a zooming component that includes three independently movable lens groups that are disposed within the lens assembly between a pair of static lens groups. The lens assembly exhibits an etendue of between 0.95 and 4.65 mm.sup.2sr.

A finite conjugate lens assembly with modular interchangeable components includes a zooming component that includes three independently movable lens groups that are disposed within the lens assembly between a pair of static lens groups. The lens assembly exhibits an etendue of between 0.95 and 4.65 mm.sup.2sr.

A finite conjugate optical assembly, comprising a lens with a core zoom module that includes five optical groups that are configured to exhibit at least 1.58 mm.sup.2sr of etendue at a lowest magnification position, and a ratio of highest to lowest magnification of at least 7:1, and to provide a maximum magnification of 2 or greater.

A finite conjugate optical assembly, comprising a lens with a core zoom module that includes five optical groups that are configured to exhibit at least 1.58 mm.sup.2sr of etendue at a lowest magnification position, and a ratio of highest to lowest magnification of at least 7:1, and to provide a maximum magnification of 2 or greater.

A finite conjugate lens assembly including an afocal zooming component that has five optical groups that are configured to provide a ratio of highest to lowest magnification between 5.5:1 and 16:1. A lens attachment module and rear adapter module may be disposed, respectively, on an object side and an image side of the optical assembly. The lens assembly may exhibit an approximate etendue between 0.95 and 4.65 mm.sup.2sr, and may be configured in accordance with between 6.6MP and 32MP image sensors.

A finite conjugate lens assembly including an afocal zooming component that has five optical groups that are configured to provide a ratio of highest to lowest magnification between 5.5:1 and 16:1. A lens attachment module and rear adapter module may be disposed, respectively, on an object side and an image side of the optical assembly. The lens assembly may exhibit an approximate etendue between 0.95 and 4.65 mm.sup.2sr, and may be configured in accordance with between 6.6MP and 32MP image sensors.

Provided is a zoom lens including a plurality of lens units, in which an interval between each pair of adjacent lens units is changed during zooming. The plurality of lens units consist of, in order from an object side to an image side: a first lens unit having a positive refractive power; a second lens unit having a negative refractive power; a third lens unit having a negative refractive power; and a rear lens group including at least one lens unit. An interval between the second lens unit and the third lens unit becomes larger at a telephoto end than at a wide angle end. The third lens unit is moved during focusing. Focal lengths of the second lens unit and the third lens unit, a focal length of the zoom lens at the wide angle end, and a back focus at the wide angle end are appropriately set.

A zoom lens includes lens units whose interval between adjacent units is changed during zooming, wherein the lens units consist of, in order from an object side, a positive first unit, an negative intermediate lens group including a unit, a positive (n1)-th unit, and a positive n-th unit, wherein the first unit moves during zooming, wherein an interval between the (n1)-th and n-th units is smaller at telephoto end than at wide angle end, wherein the n-th unit includes positive lenses LPL made of a material having proper Abbe number, wherein the n-th lens unit includes a positive lens LPH arranged on the image side of the lenses LPL and made of a material having proper refractive index and wherein a distance between lens surfaces on the most-object side and on the most-image side of the n-th lens unit, and back focus at the wide angle end are properly set.

A zoom lens includes lens units whose interval between adjacent units is changed during zooming, wherein the lens units consist of, in order from an object side, a positive first unit, an negative intermediate lens group including a unit, a positive (n1)-th unit, and a positive n-th unit, wherein the first unit moves during zooming, wherein an interval between the (n1)-th and n-th units is smaller at telephoto end than at wide angle end, wherein the n-th unit includes positive lenses LPL made of a material having proper Abbe number, wherein the n-th lens unit includes a positive lens LPH arranged on the image side of the lenses LPL and made of a material having proper refractive index and wherein a distance between lens surfaces on the most-object side and on the most-image side of the n-th lens unit, and back focus at the wide angle end are properly set.

A lens attachment module is configured for coupling with a zoom module of a finite conjugate optical assembly. The lens attachment module includes a lens assembly that has a positive focal length, and exhibits a pupil size of between 16 and 25 mm and a pupil depth greater than 50 mm.