The B+W 60HSB KB-12 (80B) Blocking Filter Blocking Filter by B+W is the deep blue filter KB 12 blocks so much red, orange and yellow that it increases the color temperature 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 reversal film, the subjects will be reproduced in their original colors. With weaker halogen bulbs or stronger 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 photographs. Its filter factor is approximately 2.
This filter uses our HSB mount made of brass. Various lenses for Hasselblad cameras are equipped with bayonets for the attachment of filters and lens hoods. The advantage of a bayonet mount over threaded filters is quick attachment and removal. HSB 60 and HSB 70 are offered.