What is Vari-Angle Prism Image Stabilizer (VAP-IS) ?
The Vari-Angle Prism Image Stabilizer (VAP-IS) is Canon's patented Image Staibilization technology developed under a long term study. HJ15ex8.5B KRSE-Vis the world's first Image Stabilizer HD Portable Lens that enbodies the VAP-IS system.
How the VAP-IS Works
Under perfect shooting conditions, light rays from a scene pass through the lens optical system in a tightly prescribed manner. Any vibration or jolt to the lens-camera system will deflect those light rays and produce image unsteadiness. The VAP-IS technology is incorporated within the lens optical system to intercept such light ray perturbations and correct their deviations in real-time. The technology to do this is based upon a flexible optical bellows that entails two flat glass elements separated by a special liquid forming a sealed mini-optical grouping within the overall lens element groupings. The bellow expands and contracts when the lens is physically disturbed and the very high refractive index of the liquid bends the disturbed light rays in the opposite direction. This imparts a high degree of real-time correction to the angle of the light rays, ensuring they arrive at the image plane devoid of any unsteadiness.