JC RN-2 lens adapter is a good and cheap solution to replace CANON LA-DC58K.
JJC RN-2 Lens Adapter allows users to add the Canon TC-DC58D Teleconverter to the Canon Powershot G10 or G11 Digital Camera.
The adapter can be taken apart into a front and back component, but both parts are required for use with the teleconverter lens.
RN-2 replaces Canon LA-DC58K.
Notes: Although the adapter has 58mm threads, attaching a 58mm filter might cause vignetting.