The lens hood works on my Canon 35-70mm F: 3.5-4.5 perfect. In the camera bag, the hood occupies little space away and serves as a spacer between the teleconverter and the telephoto lens, the lens hood Easy disappears in your pocket when I'm traveling. The thread of the lens hood reaches well into the filter thread of the lens and makes little noise (If it hook, just a drop Ballistol carefully onto the thread of the lens hood apply). The lens hood prevents lens flares (flares) and still serves as an extra protection for the lens. In addition, the hood has an internal thread with the other filters can screw. Tip: If a polarizing filter is to be used, this should be screwed in front of the lens hood. This allows to use the lens hood to change the polarization filter. The Lens Hood is a strong buy recommendation and should be in every camera bag!