Motorized Olympus BH2
The Olympus BH2 can be found as a biological microscope, normally finite, with a 160mm tube length.
For epi-illumination, a vertical illuminator must be added.
I have the BH2-MA. It will convert the system to infinity corrected 180mm tube length. Which means that standard 160mm objectives cannot be used.
Current setup
Here you can see my custom frame and the motorization.
The frame allows me to isolate the microscope during captures or when I am not using it, which prevents it from collecting dust.
The motorization is described in depth here.
Eyepiece corrections
The BH2 has specific corrections done in the eyepiece and tube lens.
For optimal performance, only Olympus MSPlan, MDPlan, NeoSPlan and NeoDPlan objectives will work.
When using the trinocular head to add a camera, a special adapter including special eyepieces (Olympus NFK) must be used to make the corrections that are normally made by the eyepiece.
Modern Olympus objectives
In practice, modern Olympus objectives will work, as demonstrated with this Olympus 100x/1.25 oil objective.
NFK eyepieces
Low magnification NFK eyepieces are rare and expensive.
For this reason I don’t use any for my captures.
Focus stacking seems enough to get very good quality images.
References
You can find a lot of useful information about Olympus BH2 systems on the Alan Wood website.