For working with daylight-balanced film under tungsten-lit conditions, this 46mm 80B Color Conversion Filter from Hoya is a cooling filter used to increase the color temperature from 3400K to 5500K. The blue color of the filter has a filter factor of 3x, requiring an additional 1.6 stops of exposure to achieve normal results.
The filter is constructed from optical glass and has a six-layer HMC coating to reduce surface reflections and glare in order to retain high image accuracy, clarity, and contrast. It is mounted within a durable, lightweight aluminum ring, which has a hard anodized finish to guard against wear.
Blue color conversion filter increases color temperature and provides a cooling effect.
Converts 3400K to 5500K for using daylight-balanced film under tungsten lighting.
Filter factor of 3 requires approximately 1.6 stops of additional exposure to maintain normal results.
The Hoya Multi-Coating (HMC) uses a six layer, three-per-side, design that helps to noticeably reduce surface reflections and glare for improved contrast and image fidelity.
Aluminum filter ring is both lightweight and durable and features a hard anodized finish to guard against scratching and wear.