I have been trying to make a picture in the image overlay feature in the nikon D40. I shoot both pictures in RAW and then proceed to the menu. I get both pictures in place but when they are combined the result is I have to ghostly images of what I combined. It is of one girl sitting in a chair and of her standing behind the chair but she is a ghost in both. There is a way to tweak it at the bottom and it goes from 0.1x to 2.0x and when I do tweak the indivdual picture it just makes one of the girl go really dark into proper focus and take out the other one all together. What might I try to get the right overlay so that both girls are in focus and are not ghost.