good price and quality top optical lensIntroduce the knowledge of optical lens

How much do you know about optical lenses? The editor of good price and quality top optical lens will take you to a simple understanding.
The new high-definition optical lens includes a lens group, a second lens group, a diaphragm, a filter, a lens barrel, and a pressure ring; the first lens group has negative refractive power, including the first lens, the second lens, and the third lens, and All are meniscus lenses with negative refractive power and convex surface facing the object surface; the second lens group has positive refractive power, including No. 4 lens, No. 5 lens, No. 6 lens, No. 7 lens; No. 4 lens and No. 5 lens are both It is a biconvex lens with positive refractive power; the sixth lens and the seventh lens are both cemented lenses with positive refractive power; the rear surface of the sixth lens and the front surface of the seventh lens are mutually cemented; one lens group, two lens groups It is coaxially arranged between the object plane and the image plane from front to back;

The above is the small series of good price and quality top optical lens: a brief introduction to the relevant knowledge of optical lenses.