| 摘要 |
PURPOSE:To enable manual photographing with suitable F value, by connecting the index barrel with the index line indicating the F value of diaphragm scale to the zoom lens and providing the index barrel so that the index can correspond to the F value changed with zooming. CONSTITUTION:The display indicating the distance is described radially at the edge of the diaphragm ring 5 of the focus ring 14 of the lens barrel 1. Further, the display indicating the iris is described radially on the diaphragm ring 5. Further, the index line 17 is indicated on the external circumference 11 of the index barrel 8. The index line 17 consists of the 1st index 18 to read the diaphragm value of the diaphragm ring 5 and the 2nd index 19 consisting of hatched lines to read the distance of the focus ring 14. When the focus ring 14 moves toward the arrow A, the index barrel 8 moves toward the arrow B and the focus (40mm.) is indicated, and the index 17 shows the distance (infinitive) and open F value (4.0), enabling manual photographing with suitable diaphragm value. |
