Dec 11, 2020
Nov 30, 2020
The spherical lens has the congenital defect of spherical aberration, which brings about the insurmountable flare phenomenon. Obviously, it will affect the image quality. With aspheric lenses, the light can be accurately projected at one point by refraction of the light through the higher-order curved surface.
Nov 03, 2020
Optical compensation zoom system: when several groups of lenses are used for zooming and compensation in the zoom objective, the movement of each lens group is carried out at the same speed and the same speed, so only a simple mechanical structure is required to connect each lens group together Just do linear motion.
Oct 27, 2020
Sep 28, 2020
As the name implies, the surface curvature of an aspheric lens is different from that of ordinary spherical lenses. In order to pursue the thinness of the lens, the curved surface of the lens needs to be changed. In the past, the spherical design was used to increase the aberration and distortion, resulting in obvious image blur.