For Canon mount, there are two versions of Kenko extension sets available. The EF only version and the EF-S version. The EF-S version is more expensive by around 20% and harder to find. You can use the EF-S version with any lens. Wide-angle lens are not good for
extension tubes. In my experience, the 50-mm normal lens gives the best result. Longer lenses require longer tubes to produce ...