There is no better lens than single aspheric lens and double aspheric lens. If the price is not considered, double aspheric lenses are better. However, if the budget is limited and you can see the aspheric lens itself clearly, you can also choose aspheric lens.

Compared with single aspheric lens, double aspheric lens is different in that:

1, the appearance treatment structure is different. A single aspheric lens, as the name implies, is just a single aspheric surface; Both sides of the double aspheric lens are aspheric. ?

2. The processing difficulty and price are different. At present, most of the "aspheric lenses" sold in the market are traditional "single aspheric lenses", that is, aspheric surfaces are made on the first side of the lens. This kind of aspherical lens is suitable for mass production with molds, and its manufacturing cost is quite low at present, which is not much different from that of spherical lenses.

3, wearing different feelings. Generally, wearing double aspheric surfaces will make people more comfortable and have a clearer vision. Single aspheric surface also has some good lenses, but the definition is not as good as double aspheric surface at the same quality.

4. Aberrations are different. The so-called phase difference is the difference between the image seen by the lens and the actual image. Because the double aspheric surfaces are two aspheric surfaces, the degree of edge deformation will be reduced, and the aberration will also be reduced, and the seen image is basically consistent with the actual image.

5, the thickness is different. The thickness of double aspheric surface is different from that of aspheric surface. Generally, the thickness of double aspheric surface is thinner than that of single aspheric surface, and the thickness is even thinner.

Refer to the above? Baidu encyclopedia-aspheric lens