The canon tc dc58d is a telephoto conversion lens suitable for use with the canon powershot g10 g11 g12 g15 g16 via the canon la dc58k lens adapter not included it multiplies the focal length of the g10 g11 g12 g15 g16 by 14x giving an effective focal length of 392 196mm it requires the la dc58k lens adapter to work unfortunately this adapter has now been discontinued and we are no longer able to get in