Large-aperture lens with adjustable depth of field

The utility model belongs to the technical field of optical lenses, and particularly relates to a depth-of-field adjustable large-aperture lens, which comprises a connecting tube, an inner tube connected onto the connecting tube in a sliding manner, lens groups arranged on the connecting tube and the inner tube, a baffle plate arranged on the connecting tube and used for adjusting the size of an aperture, and a knob arranged on the connecting tube, a spiral groove is formed in the side, close to the connecting pipe, of the rotary knob, a protruding block is fixedly connected to the inner pipe, and the protruding block is slidably connected with the spiral groove. According to the utility model, the position of the inner tube can be adjusted, the distance between the lens group on the inner tube and the lens on the connecting tube is further changed, the focal length of the lens is adjusted, and after the stop piece is matched to adjust the size of the aperture, an ideal picture with a clear focus position and