Abstract
A camera, while it is being used, is constantly subjectd to vibration by its users. That vibration, the subject of this paper, was studied in two experiments. One was the measurement of the bias size of a target in a picture. Three types of cameras were used in this experiment. The pictures taken by subjects had a target image. They were measured for bias by normal-photography and by timer-photography. The other was an analysis of oscillation sampled from the cameras. Two types of cameras were used in this experiment. Each of the cameras had three dimensional accelerometers on top of it and a manometer on its shutter button. When a subject pushes the manometer to take a picture, the oscillations were determined by the accelerometers.
From these experiments, two causes of camera vibration may be distinguished, as follows: One is camera vibration caused by microvibration on the surface of the subject's hands and physiological tremor on forearm. This oscillation is about 4.0Hz. The other is caused by the subject's pushing action against the shutter button. This oscillation is about 2.0Hz. This kind of vibration occurs because the user's pressure on the shutter button is too strong to keep the camera fixed. The results show that most of the vibration of cameras is caused by manipulation against the camera.
