Question

What is an aplantic lens?

Answer 1

An aplanatic lens is an aspherical lens, formed as the surface of revolution of a cartesian oval.

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Answer 2

An aplanatic lens is designed to minimize two monochromatic wavefront errors, called spherical aberration and coma. Spherical aberration is axially symmetric and occurs when rays from a point on the axis passing through the outer zones of the lens focus at a different distance from the lens than rays passing through the central zone. Coma is an off-axis, asymmetric wavefront distortion that increases linearly with field angle or distance from the principal axis.

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