The deep blue filter KB 12 blocks so much red, or-

ange and yellow that it increases the color tempera-

ture of very bright halogen and special photoflood

lamps (of around 3400 K) to that of daylight. With

that kind of illumination, and with daylight color re-

versal film, the subjects will be reproduced in their

original colors. With weaker halogen bulbs or stron-

ger incandescent bulbs in conjunction with this filter

and with daylight reversal film, a residue of "warmth"

will be retained for an optimal mood in interior pho-

tographs. Its filter factor is approximately 2X.