By Johan J Ingles-Le Nobel .It’s very useful website for macro photography professionals or amateurs.And thanks to Johan,he reviewed our rail as well.
http://extreme-macro.co.uk/wemacro-rail/
(The software will be upgraded soon in these weeks.Auto mode will be add in control soon).
2,http://www.microscopyu.com/articles/formulas/formulasfielddepth.html
DOF about some Nikon objective lens.You can set step length smaller than DOF of objective lens.
3,https://expertphotography.com/20-tips-shallow-depth-of-field/
What Is Shallow Depth of Field(by Jenn Mishra from expertphotography.com)