Although it is CHDK based, I thought some may be interested in my latest deep focus photography post related to the EOSM3: http://photography.grayheron.net/2020/07/quick-update-on-deep-focus-photography.html
Actually, it is very useful function when you need to take photos of properties and architecture. I took photos of ancient property in Portugal with deep focus and pictures became too realistic and catching as I sell it to exhibitions.