Does the manufacturer of spherical lens analyze the difference between spherical and aspherical? (2)
Aspheric lens, manufacturer of spherical lens say that the lens is not spherical radian, but the green part of the lens edge is "cut" a little, and its transverse section is planar. manufacturer of spherical lens believe that when light is incident on the surface of an aspherical mirror, it can be focused on a single point, the film plane, to eliminate it. Except for aberrations. For example, the flare phenomenon in spherical mirror using a large aperture will be more serious than the thin aperture, but if the non-spherical mirror can be added, the flare will be greatly reduced. Low.
manufacturer of spherical lens make a proportion: image deformation (pillow or barrel) is caused by the light in the lens is not refracted properly. Take the zoom lens as an example, it is usually barrel deformation in short focal length and pillow deformation in long focal length. If the non-spherical lens is used, the aberration in this aspect can be improved.
manufacturer of spherical lens use aspherical lens technology, which is more favorable for producing large aperture, high multiple zoom, extreme wide Angle and telephoto lenses. The image quality is improved due to the reduction of aberrations, and the volume of the mirror is also reduced. At present, many lens manufacturers in the market have indicated that some of their focal length lenses use aspheric lenses. Lightweight zoom cameras (such as 28-90mm, 38-105mm, etc.) are designed with aspherical lenses to improve image quality.
