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

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.