Dear community, I am building a microscope and one of the crucial steps for it to work is to focus an image onto a camera. However, I am failing at finding lenses with a controllable focus.
DSLR lenses have built-in motors that allow them to auto-focus, however I was unsuccessful at finding documentation about how to control them (I don't care about autofocus, I just want to be able to control the focus from a computer). Cheap cameras, like the Google Coral Camera have autofocus capabilities, but they are bad lenses coupled to cheap cameras.
Does anybody have experience with focusing lenses that can be controlled from a PC? Either directly through USB or through some intermediate electronics (arduino-like).