Patent ID: 7268953

Claim:
An apochromatically corrected microscope objective, including, from an object end: a first group of lenses (G 1 ) having overall positive refractive power, comprising a cemented group having two lenses (L 1 , L 2 ), including a first lens having positive refractive power and a second lens having a negative refractive power and a further lens (L 3 ) having positive refractive power, a second group of lenses (G 2 ) having overall positive refractive power, comprising three cemented lenses (L 4 , L 5 , L 6 ), a third group of lenses (G 3 ) having overall negative refractive power, comprising three cemented lenses (L 7 , L 8 , L 9 ), wherein the side of the third group of lenses that faces the image plane is convex, a fourth group of lenses (G 4 ), comprising a lens (L 10 ) with positive refractive power and a cemented group of two lenses (L 11 , L 12 ) including a third lens having positive refractive power and a fourth lens having negative refraction power, and a fifth group of lenses (G 5 ), comprising two lenses (L 13 , L 14 ) in a cemented group including a fifth lens having negative refractive power and a sixth lens having positive refractive power.