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Blue cooling filter, 72mm thread, dark blue glass, multi-coated, new

HOYA Filter

HOYA Filter 72mm C12 Blue Cooling Color Conversion camera filter

SKU CH-7H8G-NV4K1

72 mm blue cooling filter reduces colour temperature by 2200 K (−120 mired) to match tungsten light with daylight film, with 6-layer multi-coating for 97 % average transmittance

  • Cools tungsten light 2200 K for daylight film
  • 120 mired shift matches 3200 K sources to 5500 K stock
  • Six-layer HMC coating cuts flare and ghosting
  • 97 % average light transmission preserves exposure
  • Equivalent to 80A filter for familiar workflow

Film Photographer Tool

The 72mm C12 Blue Cooling filter is built for photographers shooting daylight-balanced film under tungsten or warm ambient light. It lowers colour temperature by 2200 Degree K with a -120 mired shift, matching 3200 K sources to 5500 K film. Six layers of HMC multi-coating push average light transmission to 97 percent while cutting flare and ghosting.

Light Loss and Exposure

The filter absorbs a noticeable amount of light, so exposure must be increased by roughly one and a third stops when metering through the lens. Deep blue density makes it unsuitable for low-light scenes where every photon counts. It is not for digital shooters who can simply adjust white balance in camera or post, nor for anyone needing neutral colour correction without a strong cooling cast.

Creative and Corrective Upgrade

Replaces the need for separate 80A-type conversion filters when working with daylight film in warm light. The jump is worth it when you want a single multi-coated glass filter that delivers 97 percent transmission and consistent -120 mired correction. It is not for productions requiring variable colour-temperature control or for users who need a lighter cooling effect such as an 80B or 80C equivalent.

Highlights

  • Cools tungsten light 2200 K for daylight film
  • 120 mired shift matches 3200 K sources to 5500 K stock
  • Six-layer HMC coating cuts flare and ghosting
  • 97 % average light transmission preserves exposure
  • Equivalent to 80A filter for familiar workflow

Specifications

No published specifications for this item yet.

Questions about this item

Which HOYA C12 filter thread size should I select for a 72 mm lens?

The product is offered in a single 72 mm diameter; choose this version if your lens barrel is marked 72 mm.

What does the 2200 Degree K cooling shift actually do when the filter is mounted?

It lowers a 3200 K tungsten source to 5500 K, matching daylight-balanced film and adding a strong blue cast.

How does the 6-layer HMC coating affect light transmission?

The multi-coating delivers 97 % average transmittance, cutting reflections and flare while preserving contrast.

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