Introduction It has been an unending quest to build an automated focus stacking rail for many focus stacking enthusiasts, ranging from modified manual rail to actually CNC machining their own rails. Every now and then, there will be a post in many popular online macro photography forum, Facebook groups, etc, about making an automated rail for focus stacking. Most of these posts and ideas are sound and usable, but they also suffer from some key aspects, namely precision and stability. Though these imperfections can be fixed by using powerful focus stacking software, the software alignment function sometimes can introduce some other artifacts -- distortion, streaking at edges, etc. These artif
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