| 摘要 |
PURPOSE:To attain macrofocusing precisely by interlocking an optical system formed independently of a normal focusing means with the operation of a macrofocusing means manually adjustable for macrofocusing and an operating member. CONSTITUTION:At the time of automatic normal focusing, a focus detecting device is drived by turning on a work starting switch, a motor M starts to rotate forwardly/reversely, a driving shaft 51 also rotates, the rotation is transmitted to a small gear 37, an inner gear 38 and a repeating tube 10 through a driven shaft 34, and a holding frame 8 is moved in an optical axis direction together with a lens group I . At the time of manual normal focusing, the holding frame 8 for the lens group I united with a manual focusing ring 7 is rotated by turning the matual focusing ring 7 and simultaneously moved in the optical axis direction by the action of a helicoid screw 22, so that the normal focusing similar to the automatic focusing can be performed. |
