Canon EF 24-105mm F/4 L IS USM should has up to 3-stops stabilizer. I'm not sure if I'm using it wrong or it's a marketing tool for Canon. In many low light situation I found that my photo will be underexposed, so I may use a lower shutter speed (3 stops down) or make the aperture wider (by 3 stops), I hold myself steady and follow some techniques to hold the camera steady and click! And almost all the photos are blurry, Am I using it wrong? How actually do you use your image stabilizer to get sharp images? Is it always true that you can used the whole announced additional stops?
BTW I'm not shooting a moving subjects just still subjects.
Update: While I was walking someday a bicycle was running behind me hit the camera and unfortunately the lens. I felt that it wasn't a major hit and I checked the lens (after long cursing and yelling) and found that it was functioning good after that (focusing was still fast, USM is quite, ....) It was perhaps the 3rd day I used the lens so I don't have photos with the same issues before that.