continuously increasing from one side of the filter to the other by changing the position of the filter selectively placing higher or lower density sections in the light path the intensity of the light emitted by the lighting apparatus may be varied the neutral density filter is selected to be generally color neutral so that the color quality of the light passing therethrough remains unchanged application_number US 88727692 A description the preferred embodiment will now be described with respect to the drawings to simplify the description any numeral identifying an element in one figure will represent the same element in any other figure fig1 4 illustrate a lighting apparatus 10 which is mountable by a bracket 8 to suitable supporting location such as camera 5 the lighting apparatus 10 includes a main housing 12 with a front wheel housing 30 a filter housing 70 and the barn door assembly 82 84 86 88 attached to the front thereof light emitted from light source 18 which is typically an electric lamp typically professional light sources employ a halide metal hmi element a xenon element or a more standard lower output incandescent lamp a light source 18 is positioned in the center of a reflector 20 which directs light from the light source 18 out along an outgoing light path 15 the relative axial position of the lighting element 18 to the reflector 20 may be adjusted by an adjustment mechanism consisting of an adjustment knob 16 attached to a screw 16a which axially translates a bracket 17 the bracket 17 is attached to the socket assembly carrier 14 into which the lamp 18 is plugged rotation of the knob 16 axially translates the socket carrier 14 thereby adjusting.