Patent ID: 7408621

Claim:
A system, comprising: a mask; and projection optics, comprising: a first group of optical components with an overall positive refractive power; a second group of optical components with an overall negative refractive power; a third group of optical components with an overall positive refractive power; a fourth group of optical components with an overall negative refractive power; and a fifth group of optical components with an overall positive refractive power, wherein the mask and the groups of optical components comprise: at least a first, second and third optical subgroup each having at least one optical component that can be displaced along an optical axis of the projection optics, wherein the first optical subgroup comprises the mask and at least one optical component from the first group of optical components, the second optical subgroup comprises at least one optical component from the second and third group of optical components, and the third optical subgroup comprises at least one optical component from the third and fourth group of optical components, and wherein the system is a microlithography projection exposure system.