The Model G microscope was a basic light microscope with an inclined monocular eyepiece tube, three magnifications of eyepieces, two sets of objectives, a plain square stage, and an Abbe two-lens condenser.
Produced in the 1960s and 1970s, this microscope could also accept most of the accessories designed for the Model S, such as the photomicrographic attachment, phase contrast equipment, episcopic illuminator, etc. A reflecting mirror mounted on the base provided illumination for this model from ambient daylight, an ordinary 60-watt light bulb, or a Nikon 15 watt substage lamp. The mirror had a flat surface on one side and a concave surface on the other to provide even illumination into the substage condenser (numerical aperture 1.3), which had an iris aperture diaphragm controlled by a single lever. There was also a filter case mounted beneath the condenser for use with color conversation, polarizing or compensating filters. The objective range offered with this model was 4x through 100x at modest numerical apertures. Focusing was accomplished through separate fine and coarse knurled knobs that moved the stage in relation to the microscope body. A pair of stage clips secured the specimen firmly onto the stage for examination.
Today Nikon offers a number of different upright microscope designs.