#astigmatism correction

• Anastigmat — A complex optical system or photographic lens, composed of an assembly of multiple lenses with different refractive indices, mathematically calculated to simultaneously correct astigmatism, field curvature, and chromatic aberration. This type of high-precision lens allows perfect and uniform focusing of light rays across the entire surface of the focal plane, ensuring extremely sharp and undistorted images both at the center and the edges.
• Anastigmatic — Free from astigmatism; optimally corrected from a geometric and optical standpoint to eliminate asymmetric convergence aberrations of oblique light rays. It is applied to systems, lenses, aspherical surfaces, or light beams capable of forming a perfect point-like image of a point object, offering exceptional flatness of the visual field.