Aspherical lenses, i.e., lenses whose refractive surface is a curved surface that is not spherical, are a type of lens as opposed to spherical lenses, and they have some features that are very advantageous in lens design. Here are some of them:
1. Ability to Eliminate Aberration
Aspherical lenses are able to eliminate aberration more efficiently, which means that they are able to provide better image quality. Aberration is an inherent defect of lenses that causes distortion and blurring of images. Aspherical lenses are designed to better correct this defect, thus providing sharper images.
2. Advantages of shallower lenses
The design of aspherical lenses allows for shallower depth lenses, which means they can be more compact and lightweight. This is important for applications that require high contrast, such as astrophotography and medical imaging.
3. Higher resolution
Aspherical lenses are designed to provide higher resolution, which means they can show detail better. This is important for applications that require high resolution, such as microscopes and projectors.
4. Easier fabrication and calibration
Aspherical lenses are relatively simple in design, which makes them easier to fabricate and calibrate. This means they can be produced at lower cost and with greater consistency, and can be industrialized more quickly. This is important for mass-produced cameras and optical instruments.
In summary, aspherical lenses offer a number of advantages in lens design, such as the ability to provide better image quality, shallower lenses, higher contrast and resolution, and easier manufacturing and calibration. These advantages have made aspherical lenses the preferred choice for a variety of optical applications such as cameras, microscopes and telescopes. With the development of optical technology, the design of aspheric lenses will continue to be improved and optimized, thus increasing the performance and quality level of optical devices.