| 摘要 |
PURPOSE:To obtain an excellent image by arranging a convex lens which extends the image-formation position of a light beam from an oblique mirror on the optical path between the slanting mirror and an eyepiece, and providing a reflecting body at right angles between the concave lens and eyepiece. CONSTITUTION:The concave lens 20 is arranged on the optical path extending from the oblique mirror in a lens barrel 6 and a right-angled prism 21 as a reflector is provided between the concave lens 20 and eyepiece 12. Namely, the right-angled prism 21 is provided in the intersection part 25 of a casing 24 having a couple of tubes 22 and 23 in a right-angled intersection shape; and the concave lens 20 is provided in one tube and those members 20 and 21 are made into an attachment. On tube is inserted into the tip part 11 of a draw tube 10 to position the concave lens 20 in the tip part 11, and the eyepiece 12 is inserted fixedly into the other tube 23, attaching the concave lens 20 and right-angled prism 21 without touching the draw tube 10 nor the eyepiece 12. |
