Heliopan Bay 70 KB 12 (80B) Cooling Color Conversion Glass Filter

BH #HEKB12B70 • MFR #707023
Heliopan
Heliopan Bay 70 KB 12 (80B) Cooling Color Conversion Glass Filter
Key Features
  • Rugged Brass Filter Ring
  • High Quality Schott Glass
The Heliopan Bay 70 Deep Blue KB12 Glass Filter blocks so much red, orange and yellow that it increases the color temperature of very bright halogen and special photoflood lamps (of around 3400K) 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.

Special Order
Expected availability: 4-6 weeks
$190.22

Important Notice

  • This item is noncancelable and nonreturnable.

Heliopan Bay 70 KB 12 (80B) Cooling Color Conversion Glass Filter

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Heliopan 707023 Overview

The Heliopan Bay 70 Deep Blue KB12 Glass Filter blocks so much red, orange and yellow that it increases the color temperature of very bright halogen and special photoflood lamps (of around 3400K) 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.

Heliopan Lichtfilter-Technik of Munich, Germany, has changed their black anodized brass filter rings on most Heliopan non-rotating filters to their "slim" mounts. These slim mounts are made of black anodized brass stock and have so little rim in front of the lens (5.4mm) that they will not vignette with lenses as short as 21mm.

Heliopan offers a wide selection of sizes, screw-in, series, bayonet, square and rectangular filters including digital, video, center weighted, graduated, wide angle, Kaesmann polarizers, drop-in polarizers, etc.

Note:
This filter is specific to lenses with Hasselblad's exclusive Series 70 (Bay 70) filter size
Used to balance daylight film under artificial, tungsten or standard (household) incandescent lighting.
Heliopan cuts, grinds, polishes and coats their filters with the same techniques and equipment as used for the finest German camera lenses.
All Heliopan screw-in type and series size filters are mounted in precision black anodized brass rings to eliminate binding or cross threading and to ensure optimal alignment.
Filters still retain front threads for a lens cap, a lens hood or even stacking a second filter.
The portion of the Heliopan slim filters that are in front of the lens have been reduced in thickness by 37% over the former mount.

80 Series Color Conversion Chart

80A increases color temperature from 3200-5500 Kelvin (commonly used with 3200K lamps)
80B increases color temperature from 3400-5500 Kelvin (commonly used with photoflood lamps)
80C increases color temperature from 3800-5500 Kelvin (commonly used with flashbulbs)
80D increases color temperature from 4100-5500 Kelvin (commonly used to remove extreme orange or red)

Heliopan 707023 Specs

TypeColor Conversion
Size Bay 70
GradeKB12 (80B)
Filter Factor4 (+2 stop)
Multi-CoatedNot Applicable
RotatingNot Applicable
EffectBalances daylight film for use with most standard tungsten lighting, studio lighting and copy stand lighting
ApplicationUsed to shoot daylight film under artificial (household) lighting conditions
Color TemperatureIncreases color temperature from 3400-5500 Kelvin
ConstructionSchott Glass
Front Filter Thread Size Bay 70
Front Lens Cap SizeBay 70
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