| 摘要 |
PURPOSE:To enhance resolution and to select a wide field angle by providing an object lens consisting of two convex lenses, a relay lens which relays an image due to this object lens, and an eyepiece lens system through which an image due to this relay lens is observed. CONSTITUTION:An optical system is provided with a lens L1 of the front group, where a glass block 11 and a convex lens 12 are joined, and a lens L2 of the rear group consisting of a convex lens 13. An aperture diaphragm 14 is provided on the joint surface between the glass block 11 and the convex lens 12. A field stop 15 is provided between the rear end face of the lens L2 of the rear group and the front end face of a relay lens 2 (SELFOC lens), and both end faces are adhered to each other. By this constitution, resolution is enhanced, and a wide field angle is selected. |
