It’s [Steve’s] LED light ring for a stereo microscope. It’s also a shout ... with any high-end optical microscopy. Are these features something that is available on commercial hardware ...

If you’re looking for a more capable lighting solution for your microscope, then check out “AZIZ! Light!”, a microscope ring light with a number of different features.

You should not look through the microscope to do this. Line it up so that the specimen - if you can see it - is in the centre of the stage, where the light passes through. Focus the slide by ...