Ronny,
Yes, focus stacking was what I was referring to. I checked out the video link you sent and then a couple of others.
All methods seem to require a focusing rail. I checked those out on Amazon and read reviews. The under $100 versions all seem to suffer from creep unless used horizontally or only at a slight downward angle. All of my photos are taken straight down from a copy stand and it would seem that these inexpensive rails would not work well for me.
Jack