The advantages of aspheric lenses include:
2024-12-17
The first advantage of aspheric lenses is the reduction of spherical aberration. Spherical aberration occurs when a lens cannot focus all incoming light to the same point without distortion. Even when manufactured to theoretical limits, standard spherical lenses can never achieve the precise focusing level provided by aspheric lenses. The essence of the irregular surface shape of aspheric lenses is to allow for more precise manipulation of multiple wavelengths of light simultaneously, resulting in clearer images.
Another optical benefit of aspheric lenses is the ability to correct off-axis aberrations such as field curvature. Typically, optical designers must 'stop down' their optical systems to physically exclude the outermost regions of the lens, which can cause image distortion near the edges. Because aspheric designs can better correct incoming light to the focal point, they increase the usable aperture of the lens, allowing for greater light throughput.
Finally, one of the greatest benefits of using aspheric designs is the reduction in the total number of lenses required to achieve a given result. As aspheric lenses can better control the light passing through the system, in many cases, a single aspheric lens can provide the same precision as multiple standard lenses used in series. This reduces overall weight, size, and potentially lowers the cost of the final design.
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