... Koehler illuminator systems, wide-range voltage 90-240V, 6V/30W halogen lamp, pre-centered, with continuous intensity control. Lamp filament’s ... group), with field diaphragm and aperture diaphragm, 12V/50W halogen bulb, lamp filament’s center and focal length can be ... filter group), with field diaphragm and aperture diaphragm, 12V/50W halogen light house(R), lamp filament’s center and focal length can ...