Patent ID: 7245438

Claim:
A method for providing high order color correction inspection of a specimen, comprising: constructing at least one lens from a relatively low dispersion glass; further constructing at least one additional lens from an additional material different from the relatively low dispersion glass of the at least one lens, wherein the additional material generally matches low dispersion properties of the relatively low dispersion glass; still further constructing at least one further lens from a further material different from the relatively low dispersion glass and the additional material; and positioning a first plurality of lenses comprising a positive lens on one side of a gap and a second plurality of lenses comprising a negative lens on another side of the gap, wherein the first plurality of lenses inserts a significant amount of color, and the gap and second plurality of lenses substantially cancel the significant amount of color; wherein dimensions of the first plurality of lenses, gap, and second plurality of lenses are selected to reduce lateral color and decrease centroid shifting due to different colors encountered during inspection.