Looks good -- I assume this is the Mitutoyo 20x/0.42 M plan APO, using Helicon Focus for the 3D view?
Correct on the Helicon Focus for the stacking and 3D rendering. The lens is a Nikon 20X Measuring Microscope lens. It is telecentric, with extremely long working distance, so very nice to use and for stacking. Those are household dust. The coin was sitting out for a while and I forgot to blow it off.
One thing I did not mention was that in the past I was not able to do stacking with this lens. My stacking system has a minimum step size of 1.25um, but the accuracy is not so great at minimum step, so the 3D renderings end up being distorted. For these images, I used an experimental stacking system based on a small full-range speaker, driven by DC. The speaker has enough linear movement for the entire stack, and can be made to move infinitesimal amounts very smoothly and linearly. I am confident I could use this system for any practical magnification. If folks are interested in more info I can link to some pics and data, or explain how to put the system together if you want to try it.
