| 摘要 |
PURPOSE:To make the quantity of light incident to a photographing face or an observing face constant, by interlocking a magnification varying means and a light quantity controlling means with each other. CONSTITUTION:An object lens 12 and zoom lenses 13 and 14 are provided in the front of an image guide 11, and an eyepiece 15 is provided in the back of the image guide 11. Zoom lenses 13 and 14 are wound around the first roller 161 and are connected to a wire 171 attached to an operation dial 18. A wire 172 is wound around the second roller 162 interlocking with the first roller 161, and both ends of this wire 172 are attached to movable pieces of a diaphragm 21. When zoom lenses 13 and 14 approach each other by the operation dial 18, that is, the view angle is narrowed (telephotographic), the diaphragm 21 is opened wide; and in the reverse case, the diaphragm 21 is stopped down. |
