I think also, that canon uses 58mm, check it on canon's website for sure!...but one thing...i wont use the 18-55 kit objective for macros! (don't like thatone for anything

) for macro i think between 100-180 mm lens are the best, or there are spec macro lenses, used on a tripod, and if needed some brighten flash but not direct flash on the object.
made it with 160mm ISO100, aperture was about F6..also needa little photoshop work, but just corrected the contrasts on it.
"ice age of 2008"