red filter this particular lighting configuration would result in the defects in the clear coating which lie in the same plane as the beam axis of the light source provided with the red filter to be colored green and the defects in the clear coating lying in the same plane as the beam axis of the light source provided with the green filter to be colored red it is thereby possible to determine the orientation of the clear coat defects with reference to the aforesaid beam axes with an aperture of 16 the defect of the clear coat appears clearly but the light is poorly distributed a wider aperture of 4 leads to a better distribution of the light and to a good view of the defect but with a lesser sharpness an aperture of 22 however allows for the observation of the defects present in the substrate and of the defects in the clear coat if the spotlight intensity is increased such as 1 000 w both types of defects appear at an aperture of 5 6 but with a lesser definition with respect to the rest of the cell the tests have been performed using a 34 hasselblad 34 camera equipped with a viewfinder designed for polaroid cameras a 55 zoom and a 6 u00d7 6 cm 2 type l 34 kodak 34 film for artificial light this is the configuration with a diffuser equipped spotlight facing the viewing apparatus and two sources respectively red and.