Patent ID: 7170682

Claim:
A distortion aberration eliminating filter comprising: a transparent substrate; and a wave regulating transparent multi-layer film formed on at least one principal plane of the transparent substrate, including multiple layers of different widths so as to form a film thickness of the wave regulating transparent multi-layer film, a film thickness distribution of the wave regulating transparent multi-layer film configured to compensate a distortion aberration of an optical system; wherein the width of at least some of the multiple layers are configured to compensate a distortion aberration having a wavefront aberration proportional to: φ=y 0 3 ρcos θ, wherein: φ represents a shift quantity or distance of the wavefront, y 0 represents a coordinate measured from a surface of the transparent substrate, ρ represents a radius of a pupillary surface of the wave regulating transparent mutli-layer film, and θ represents an angle of rotation with respect to a horizontal axis.