I know little about taking a good photo. I do it like Ed, little light and 15 sec. If I do it any other way the photo colors never look like what I see. But I will keep at it.
About image stacking with different focuses. Don't you need a camera with a remote control? How do you touch the camera without it moving, even with a tripod? I never even though about using a program because I didn't think I could get all the photos to line up.