Description

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
C2	200°K (-20 Mired Shift)	82A
C4	350° K (-40 Mired Shift)	@82C
C8	1700° (-80 Mired Shift)	80C
C12	2200° (-120 Mired Shift)	@80A

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Specifications

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