Canon TC DC58B - Converter

Convertor lens gives excellent zoom but as others have said there is a little distortion at the edges of the full digital zoom shots but for results v. costs it is a great product to add to the Powershot S5 IS.

Great optics, shame about the size. This is big and heavy and clumsy, so even if you buy it I almost guarantee it will stay in the box. The new G10 has a 28mm lens, so if you want wide, go for that.