With the advances in technology, the requirements for the quality of the lens is becoming more and more severe, and at present the lens processing is still using the traditional method of traditional lens design mainly by increasing number of lenses, changing the glass refractive index and dispersion, to correcting lens with spherical aberration color, in order to improve the imaging quality of lens, but the lens from raw materials, to artificial processing, assembly and so on a series of error, makes the traditional lens image quality can't meet the design requirements.

In addition, to increase the number of the lens is used to correct the aberration, if increase convertible many aberration value will increase, senior aberration is more difficult to correct, cause the loss of resolution, color distortion, so the sphere lens convertible is generally not more than 5 times.

Aspherical lenses improved image quality

Aspheric surface can be divided into two kinds of rotational symmetry and not rotating symmetry. Aspheric lens optical system can effectively eliminate the optical system of the existence of various aberrations, such as spherical aberration, coma, astigmatism, off color, such as bending and distortion if only make the center of the lens of pervious to light, can reduce the spherical aberration, coma, astigmatism and so on three types of aberration caused by imaging fuzzy problems, but to like bending, distortion and color difference does not work. Aspherical lenses, however, is not only the decrease in the number of lenses, shrinkage, resolution and prime lens, color reduction, convertible expanded to more than 10 times.

Although the aspherical lens, the cost is higher because of the large processing difficulty factor not widely available, but as the development direction of lens has been praised by the industry.

Aspheric lens acceptance are increasing

Aspheric lens used in civilian camera, at present stage is given priority to with low price of the plastic aspheric lens. , large temperature difference for the environment is poor, many aspherics using optical glass. The past aspherical glass lenses processing and inspection is difficult, high cost, failing to popularization and application. Along with the development of aspheric surface lens manufacture technology, have been able to batch processing this difficult glass aspherical lenses, also be used in the bad environment monitoring camera.