Patent ID: 6038068
Filing Date: 2000-03-14
Classification: G02B

Abstract:
An atmospheric dispersion correction lens system comprising, in order from a light entrance side to a light exit side, a first lens and a second lens,wherein the difference in the Abbe numbers of said first and second lenses is at least 20 and the refractive indexes of said first and second lenses differ by 0.01 or less,wherein said first lens has a spherical surface on the light entrance side and said second lens has a spherical surface on the light exit side, and the spherical surfaces have a substantially common center of curvature, andwherein said first and second lenses are rotatable as a unit around the common center of curvature to adjust a tilt angle of an optical axis of said first and second lenses with respect to an optical axis of said aberration correction system so as to correct a deviation of an image occurring due to the atmospheric dispersion.