C4 Blue Cooling Color Correction
C4 Blue Cooling Color Correction

C4 Blue Cooling Color Correction

Regular price$54.90
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  • Designed for Film Photographers
  • Reduces Color Temperature by 350°K (-40 Mired Shift)
  • Helps balance warm lighting conditions by adding blue cooling effect
  • 6 layers of HMC multi-coating
  • Equivalent to @82C Filter

The C4 color correction filter cools the ambient light entering the lens by 350° kelvin (-40 mired shift) by adding blue to the overall exposure. This filter helps fine-tune the color or look of your scene to match your film's white balance.

The Hoya C4 filter is helpful when:
  • You are using tungsten-balanced film and the light source is warmer than the traditional 3200° K and you need a specific amount of color correction to match your film type. Candles and low watt incandescent bulbs are examples of warm light sources.

  • You are shooting at sunrise or sunset with daylight-balanced film (5500° K) and the overall scene is too warm. The filter will help cool the scene for a more natural look.

HOYA Multi-Coat (HMC) filters are recommended for enhancing the performance of today’s multicoated lenses. These popular filters minimize reflection, reduce flare and ghosting, and result in over 97% average light transmission.

Comparison of C Series Filters:
FILTER Cooling Amount Equivalent


200°K (-20 Mired Shift)

C4 350° K (-40 Mired Shift) @82C


1700° (-80 Mired Shift)

C12 2200° (-120 Mired Shift) @80A
Exposure loss: 2/3 Stop
Mired Shift -40
Equivalent Filter @82C
Glass Type: Hoya Optical
Number of Multi-Coatings: 6 total / 3 each side
Hardened Top Layer: No
Anti-Static: No
Frame Construction: Low Profile / Aluminum
Front Filter Threads: Yes