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Round 46mm blue glass camera filter with silver metal rim

HOYA Filter

HOYA Filter 46mm C12 Blue Cooling Color Conversion Multi-Coated Glass Filter

SKU CH-00FS-SD08B

A 46mm blue cooling filter that converts 3200K tungsten light to 5500K daylight film with a 2200K shift and six-layer multi-coating

  • Cools tungsten light by 2200 K for daylight film
  • 120 mired shift matches 3200 K sources to 5500 K balance
  • Six-layer HMC coating cuts flare and ghosting
  • Equivalent to 80A filter for standard colour correction
  • 46 mm thread fits compatible lenses directly

46mm C12 Blue Cooling Filter

The Hoya 46mm C12 Blue Cooling Color Conversion Multi-Coated Glass Filter is a screw-in glass filter for 46mm lens threads. It converts 3200 Degree K tungsten-balanced light to match daylight-balanced 5500 Degree K film, making it suited for film photographers shooting under warm ambient sources. The filter applies a deep blue hue by reducing colour temperature by 2200 Degree K.

Check Thread Size and Film Stock

Verify that your lens has a 46mm front filter thread before ordering. This filter is designed for use with daylight-balanced film rated at 5500 Degree K; it will not produce the intended correction if used with tungsten-balanced film or digital white-balance settings calibrated for other colour temperatures. Ensure your lighting conditions are tungsten-based at approximately 3200 Degree K for accurate conversion.

Replaces 80A Filter for Film Work

The C12 provides an equivalent correction to a standard 80A filter, delivering a -120 mired shift. The jump is worthwhile when you need multi-coated glass to minimise reflections and flare while converting tungsten light for daylight film. It also serves creative day-for-night effects on overcast days. It is not for shooters who need neutral density, circular polarisation, or digital sensor white-balance correction.

Highlights

  • Cools tungsten light by 2200 K for daylight film
  • 120 mired shift matches 3200 K sources to 5500 K balance
  • Six-layer HMC coating cuts flare and ghosting
  • Equivalent to 80A filter for standard colour correction
  • 46 mm thread fits compatible lenses directly

Specifications

No published specifications for this item yet.

Questions about this item

Does the 46mm C12 filter come with a case or do I need to buy one separately?

The filter ships in its protective packaging; a separate storage case is not included and must be purchased if desired.

Should I choose the C12 or the 80A version for tungsten-to-daylight correction?

The C12 is equivalent to an 80A filter, so both provide the same 2200 K colour-temperature shift for daylight-balanced film.

What does the -120 mired shift actually do to my 3200 K tungsten lighting on 5500 K film?

It cools the 3200 K source by 2200 K, matching the light to 5500 K daylight film for accurate colour rendition.

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