The embodiment of the invention discloses an 8K ultra-high-definition optical
endoscope and an imaging
system, relates to the technical field of
medical instruments, and aims to provide an optical
endoscope with higher resolution. The optical
endoscope comprises a tube body, an objective lens group and a
relay lens group, the objective lens group and the
relay lens group are arranged in the tube body, the
relay lens group is arranged at the image space of the objective lens group, and a collimation magnifying lens group is arranged at the image space of the
relay lens group; wherein the objective lens group is used for imaging an observed object; the
relay lens group performs
relay transmission on the image formed by the objective lens group; the collimation magnifying lens group amplifies the
light spot of the image space of the
relay lens group into a parallel collimation
light spot, so that the light emergent angle of the relay lens group is consistent with the light incident angle of the pick-up lens, and the size of the parallel collimation
light spot formed after amplification is consistent with the size of the
entrance pupil of the pick-up lens; and the light emitting side of the relay lens group is the image side of the relay lens group. The embodiment of the invention is suitable for the scene of medical examination and operation through the endoscope.