Electronic Image Stabiliser. Feature that minimises effect of camera shake. Originally designed for video cameras. Canon has transfer the technology over to its EF lenses, we expect more Canon's EF lenses will adopt this feature.
Electronic image stabilization: Camcorder circuitry that alters an image to counter shaking. It can make an image more blurry.
Abbreviation for electronic image stabilization, circuitry that attempts to counteract the negative effects of shaking the camera by electronically altering the image, oftentimes resulting in the increase of blur.