Up the range and effect of color temperature change the color lens is bigger, can obviously improve the light source color temperature, the lens color is dark blue.

Because the film is more commonly used solar type, balance color temperature is 5500 k, in the 3200 k light, images taken by obvious red, orange.With rising temperature mirror is therefore can make the light source color temperature increased significantly, to get the pictures of color balance.

Type reversal film using sun under the irradiation of iodine tungsten lamp light indoors, photograph of red still colour (see photo A)

Add with higher color temperature after the mirror, color correction (see photo B).