Canon IS systems are described in detail at: http://www.canon.com/technology/t_seihin/tech_dvcam.html
Under Variable Angle Prism one can read: "When the camera shake occurs, it is detected by the vibration sensor, and the optimum correction value is calculated by the microcomputer. With the electromagnetic actuator, the prism vertical angle is freely controlled to correct the vibration of the optical axis." Under Image Stabilizer System one can read: "With two vibrating gyroscopes to detect vertical and horizontal movements, the camera shake is detected; the corrective optical system is moved in parallel with the film plane in accordance with the amount of the camera shake, and the light is refracted in the appropriate direction to cancel the image vibration. The response time from the detection of camera shake to the drive of the corrective optical system is only 2/1,000 seconds. The correcting effect is about 2 steps* in terms of shutter speed. With a lens of 300mm focal length, the camera shake can be prevented in even 1/60 second." Antti-Pekka --- Antti-Pekka Virjonen Computec Oy, Turku Finland Gsm: +358-500-789 753 www.computec.fi * www.estera.fi
