QUESTION: I recently had a problem with The 18 - 135 mm kit lens for the 60D. It didn't always focus. They indicated the image stabilization was not working properly. I was not aware of this. And cannot tell the difference in pictures I take now.
My question is how do I test for image stabilization? -Larry
ANSWER: The primary role of image stabilization is to eliminate camera shake. The phenomenon is easy to spot in your photos. It looks like an overall softening of the picture; as if nothing is in precise focus. A mis-focused shot, on the other hand, will have *something* in focus, just not what you were shooting for.
To test image stabilization, start with a lens that you know is working properly. Turn on IS and use 1/8 of a second shutter speed (Shutter Priority mode is an easy way to do this). Hold the camera with one hand and take a picture. Then turn off IS and repeat the procedure. Compare both shots at 100 percent on your computer.
The image captured with IS on should be noticeable sharper. Once you have your testing system down with a good lens, then apply that procedure to the lens in question. You should be able to tell if its image stabilization is working.