https://www.sciencedirect.com/science/article/abs/pii/S0143816614002553
https://analyticalsciencejournals.onlinelibrary.wiley.com/doi/epdf/10.1002/jemt.20118
Software based
https://www.hindawi.com/journals/js/2021/5643054/
https://github.com/lozuwa/autofocus_algorithm_for_microscopes_open_source_version
deep learning:
UCLA
https://pubs.acs.org/doi/10.1021/acsphotonics.0c01774
A very good review
https://onlinelibrary.wiley.com/doi/10.1002/jbio.202000227
Commercial systems
http://www.madcitylabs.com/cfocus.html
Nikon - perfect focus system
ASI - CRISP
https://www.asiimaging.com/products/focus-control-and-stabilization/crisp-autofocus-system/
https://github.com/HoldenLab/microscope-focus-lock
https://journals.plos.org/plosone/article?id=10.1371/journal.pone.0107216
knob control manual xy stage
https://www.ysctechnologies.com/hd-digital-microscopes-products
https://bolioptics.com/xy-gliding-table-measurement-manual-stage-for-microscopes-with-back-light-window/
https://www.microscope.com/omano-xy-stage-attachment-for-4000-series-stands.html