Focus Stacking.... or lets us Nikon's terms ....Focus Shift Shooting is supposed to grab a pic, in steps, from front to back and when you stitch them together, you get that beautiful focus stacking image that has everything in focus that your MACRO lens simply can't get in one shot. It expands the depth of field for a range.
I did it for about 1".
The settings were correct and 21 images should have covered the PEG. If you look at the coiled string, not all of it is in focus and it should be. PHOTOSHOP failed me. It doesn't this constantly with the version I have. Useless as a feature, basically.
The program is supposed to grab only the focused stuff and not show the blurred out parts. It is not don't that here or you would not see any part of that peg out of focus. I have tried this a number of times and have come up with the same results on different images.
Have to learn why this is happening.