IS (In-lens Image Stabilisation) - RF Lens World - Canon South & Southeast Asia

In-lens IS (Optical Image Stabilizer)

Whether one is an amateur photographer or a professional, the problem of camera shake — which results in blurry images — is often hard to avoid. The most conventional way to deal with camera shake is to increase the shutter speed (The minimum optimal speed is generally calculated as 1/x seconds, where x is the focal distance, measured in millimeters). To resolve this problem, Canon devised a high-precision in-lens image stabilization (IS) system that effectively compensates for camera shake. When an unsteady hand causes the camera lens to tilt as the shutter is pressed, light from the subject is bent relative to the optical axis. The result is a blurry photo. Canon’s in-lens image stabilizers work by shifting the position of the lens group, parallel to the focal plane. If the IS lens group shifts on a plane perpendicular to the optical axis, to exactly match the degree of image shake, the light rays reaching the imaging surface will remain steady, resulting in a sharp, clear image. Canon uses two oscillation gyros in the lens, to detect any degree of tilt, while a compact and highly responsive moving actuator adjusts the positioning of the IS lens group. The position of the IS lens group is then confirmed by sensors that provide feedback. The system places the optimal IS lens array in the optimal position for each lens. While the concept is simple, the result is exceptionally precise image stabilization. This adjustment also ensures that the image in the viewfinder remains steady, so it is easier to frame the subject and compose the photo.

This ability to accurately compose photos by looking through the viewfinder is one major advantage of in-lens IS. Canon is committed to preserving its leadership in performance among manufacturers of high-performance, interchangeable-lens cameras. With many lenses available, from wide-angle to super telephoto, the broad lineup of Canon L-series IS lenses gives professional photographers a greater range of shooting options than ever before.