FocusStacker

This is an excellent interactive visual calculator for optimizing focus distances and aperture when focus stacking. It may be more optimized than necessary in many field situations, but if you need the best guidance and have the time to apply it, you will be pleased.

How sharp do you want your final focused-stacked image to be? Let this app know and it will tell you what to do. It delivers perfect results every time. Without this tool, you are merely guessing on the decisions you need to make. How many shots? Where are the shots focused? What f/stop? Yes, photography is an art, but this part of it is a science. So if you want to get the very best results from your camera and lens, do yourself a favor and get this app.