hi there, i'm a graphic artist and i recently purchased a G9 to take pictures of my graphic work. i usually take pics while the cam is on a tripod and i photograph flat pieces of art that are hanging on the wall. i need to get the whole shot of the work hanging on the wall and i'm asking if anyone knows a proper setting to shoot a flat square or rectangle without a bowing effect? i cannot crop to the image because i need to reflect how the piece hangs on the wall. i know i can buy an lens conversion kit but i have no idea what lens would create a flattening effect and not make a square or rectangle bow. is there a setting on the cam that will lessen this bowing effect? or possibly a lens attachment that will do this?