https://www.digital-usb-microscopes.com/meiji-techno-ma794-auxiliary-objective-lenses.html
Meiji Techno MA794 Auxiliary lens 0.5X for EMZ-8TR, 8TRD,8TRU,8UD,8U,W.D. 174mm
Meiji Techno has a large selection of interchangeable super widefield eye-pieces and auxiliary objective lenses available for EM Series stereo microscopes.