I’ve now completed my first pass at focus shift (see the free introductory article Introduction to Focus Shift). DAP now includes several additional lenses in the 50mm range, as well as ~35mm, ~100mm and 135mm lenses. Canon, Nikon, Voigtlander, Zeiss and Sony Alpha now have coverage.
The ~50mm focal length is most problematic in general. Why this should be is unclear. Read the full report in DAP for details.