The invention discloses a large-aperture large-target-surface high-resolution close-up automatic focusing optical lens which is composed of a transmission group G1, a transmission group G2, a transmission group G3, a transmission group G4, a transmission group G5 and a
detector assembly module which are sequentially arranged from an object space to an image space, the transmission group G1 has negative focal power, the transmission group G2 has positive focal power, the transmission group G3 has negative focal power, and the transmission group G4 has positive focal power. The transmission group G4 has positive focal power, the transmission group G5 has positive focal power, and the
detector assembly module is composed of a protection window, an
optical filter and an
image plane which are arranged from the object space to the image space. The lens has the advantages of being large in aperture, large in
target surface and high in resolution, the close-up distance can reach 0.1 m, the working
wavelength ranges from 435 nm to 635 nm, the telephoto distance is infinity, when the
object distance is changed from infinity to the close-up distance, the focusing
stroke is short and only needs 1.9 mm, zooming is rapid, the lens is short, the application range is wide, and the shooting effect is good.