We have mounted a three inch diameter 50 cm focal length objective on a Cenco optical bencho In front of the objective lens is an iris diaphragm and beyond the lens are various filters, a ground glass screen, and a single lens eyepiece. The distant object is a 150 watt clear bulb with a horizontal coiled filament. Its brightness is controlled with a variac. The real image produced by the objective on the ground glass is viewed by the eyepiece. Then the ground glass is removed. The sharpness of the image is studied with various filters and with various apertures in front of the objective lens. The quality of the image improves until the iris diaphragm aperture is about 5/16ths of an inch. At this point one has reached the resolving power of the telescope for the individual coils of the filament. The image of the separated coils fuse together. One can detect the difference in the resolving power for red and blue light.