| 摘要 |
PURPOSE:To readily determine correct exposure by matching the object distance of a lens to the subject and setting aperture opening value at the value corresponding to this distance. CONSTITUTION:The fixed opening directions of supporting legs 5 are such that the two supporting legs provided in the direction parallel to the bottom of the camera mounted to a stage 4 assume an opening angle which gives the longer side of the photographing field of view and that the other one supporting leg assumes an opening angle that gives the shorter sides of the photographing field of veiw with the face inclusive the two supporting legs. Hence, the rectangular area which comes within the opened supporting legs 5 gives the photographing field of view. If the object distance of the lens is matched to the subject by telescoping the supporting legs 5 in this way, it turns out that the camera 1 is set at the aperture opening value corresponding to the distance scale, thus exposure conditions are maintained constant irrespective to the extension or contraction of the supporting legs 5. |
