IS is synonymous with high-precision image stabilization
How the in-lens image stabilizer works
Camera shake causes lens movement during image exposure, which shifts the angle of incoming light relative to the optical axis and results in blurred images. Canon IS Lenses correct for camera shake by shifting certain optical components in inverse relation to the lens movement. This maintains the position of incoming light rays on the film or capturing element and helps prevent blur caused by camera shake.
New Hybrid IS technology: Designed especially for macro photography
Conventional image stabilization technology is useful for reducing the effects of camera shake in non-macro shooting situations. When shooting handheld close-ups at 1x, however, camera shake makes it difficult to achieve acceptable results even with lenses incorporating conventional image stabilizers. Now, thanks to the Hybrid IS found in the EF100mm f/2.8L Macro IS USM, Canon extends IS technology to the macro realm, making it easy to obtain clear handheld close-ups — a world first* and a definite advantage in environments where use of a tripod is not an option.
* For SLR cameras with interchangeable lenses
Problems associated with camera shake
Understanding Hybrid IS
In macro photography, shift camera shake and angle camera shake affect both the image formed on the sensor and the image shown in the viewfinder. This is especially relevant to handheld shooting at 1x, since the inability to properly compose and focus due to a shaky image in the viewfinder makes it extremely difficult to record sharp images.
Conventional image stabilizers of the type found in Canon IS lenses incorporate a vibration gyro (angular velocity sensor) to compensate for angle camera shake. Based on the amount of camera shake detected by the sensor, the IS system calculates the amount of shake on the image plane. Lens elements in the IS are then positioned to compensate for the camera shake. However, this type of image stabilizer can neither detect nor correct shift camera shake common to handheld macro photography.
The Hybrid IS includes an acceleration sensor in addition to the conventional vibration gyro (angular velocity sensor). Based on the amount of camera shake detected by the two sensors, a newly developed algorithm calculates the amount of shake on the image plane. Lens elements in the IS are then positioned to compensate for the two types of camera shake — a first in an interchangeable lens for SLR cameras and an excellent way to solve the problem of camera shake in macro photography.
Dynamic IS for superb movie-shooting performance