Long-focus optical lens

Abstract

The invention discloses a long-focus optical lens. The lens comprises a first lens with double-convex positive focal power, a second lens with double-concave negative focal power, a third lens with double-convex positive focal power, a fourth lens with double-convex positive focal power, a fifth lens with double-concave negative focal power, a sixth lens with double-convex positive focal power, a seventh lens with double-concave negative focal power an eighth lens with double-convex positive focal power, and a ninth lens with double-concave negative focal power which are sequentially arranged from an object plane to an image plane, each lens is a glass spherical lens, the first lens, the second lens and the third lens are glued to form a first lens group, the fourth lens and the fifth lens are glued to form a second lens group, the sixth lens and the seventh lens are glued to form a third lens group, the eighth lens and the ninth lens are glued into a fourth lens group, and the overall focal length of the lens is larger than the total optical length. The lens can effectively correct aberration, improves imaging quality, has larger clear aperture and focal length compared with a lens of the same type, and realizes high-quality telephoto imaging.

Description

technical field [0001] The invention belongs to the technical field of optical lenses, and in particular relates to a telephoto optical lens. Background technique [0002] Telephoto lenses are used to image distant objects, and are characterized by relatively small apertures and small field of view angles. It is often used in telescopes as its objective lens to observe distant objects with eyepieces. The usual form of a telescope is a visual system, so its specific implementation form is a monocular or binoculars. Because the telephoto lens in the visual telescope is used in combination with the eyepiece, prism or lens steering system, there are aberrations, which reduces the imaging quality. And at present, there are also telephoto lenses on the smart electronic device side, such as mobile phones, which directly record and display images with image sensors, eliminating the need for human eyes to observe. However, due to the limited space of smart electronic devices, the a...

AI Technical Summary

Problems solved by technology

Since the telephoto lens in the visual telescope is used in combination with the eyepiece, prism or lens steering system, there are aberrations, which reduces the image quality

And at present, there are also telephoto lenses on the smart electronic device side, such as mobile phones, which directly record and display images with image sensors, eliminating the need for human eyes to observe. However, due to the limited space of smart electronic devices, the aperture of the telephoto lens is limited ( Such as 5mm) and focal length (such as about 10mm), it is difficult to achieve the imaging effect of a conventional telescopic objective lens

Images