| 摘要 |
<p>An additional knurled ring for optical lens (6) is composed of an annular portion and teeth (14) distributed in a radial direction around the outside of the annular portion. The inner diameter and shape of the knurled ring match the outer diameter and shape of an adjusting ring of the optical lens. The additional knurled ring is movably connected with the outside of the adjusting ring of the optical lens. Since the additional knurled ring for optical lens can be extended towards the front of the lens and beyond the front end of the optical lens, the interference of parasitic light with the imaging of the optical lens is blocked. Digital scale designations (20) are engraved or printed on the outside of the additional knurled ring for optical lens, the position of the scale and the value of the designations corresponding to the focal length, aperture, and focal range information of the optical lens. The front end with the enlarged outside diameter of the additional knurled ring for optical lens is movably connected with a cap (21), the shape and size of the cap matching those of the front end of the additional knurled ring (6).</p> |
