Optical Image Stabilization works by isolating the internal lens parts from the camera.
CCD-shift Image Stabilization works by isolating the CCD sensor from the camera.
The experts say the optical method is more effective.
But ... when you are working with DSLR cameras, there is something else to consider:
The CCD method puts the Image Stabilization part inside the camera.
That means that any lens you put on the camera will have the benefit of Image Stabilization.
When you use the optical method, the Image Stabilization parts are in the lens.
That means, if you want Image Stabilization on every lens; you will have to buy every lens with Image Stabilization built-in.
Therefore, you pay more for each lens.
Optical Image Stabilization adds about 40% to the cost of the lens.
What's the difference between optical IS and a CCD-shift image stabilization system? Which one is better?