Prime lens

• Main Authors: CHENG JIAJIAN, ZHANG YUAN, WU MENGTING, YING YONGMAO
• Format: Patent
• Language: Chinese; English
• Published: 04.11.2022
• Subjects: OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS; OPTICS; PHYSICS

The invention relates to a prime lens in a direction from an object side to an image side along an optical axis. The invention relates to an optical lens, which sequentially comprises a first lens with negative focal power, a second lens with negative focal power, a third lens with positive focal power, a fourth lens with positive focal power, a fifth lens with positive or negative focal power, a sixth lens with positive focal power, a seventh lens with negative focal power and an eighth lens with positive focal power, wherein the second lens is a paraxial region convex-concave lens; the third lens is a paraxial region convex-concave lens, and the fifth lens is a paraxial region concave-convex lens; the diaphragm is positioned between the third lens and the fourth lens or on the object side surface of the fourth lens; the distance T1 between the object side surface of the sixth lens and the image side surface of the eighth lens and the back focal length BFL meet the following relation: 1.30 < = T1/BFL < = 1.3