Hoya 82mm W4 Umber Warming Color Correction Multi-Coated Glass Filter

W4 color correction filter warms the ambient light entering the lens by 500 Degree kelvin (+40 mired shift) by adding light amber color to the overall exposure. This filter helps fine-tune the color or look of your scene to match your film's white balance or creative vision.The Hoya W4 filter is helpful when:• You are using daylight-balanced film and the light source is colder than the desired look and you need a specific amount of color correction to match your film's color balance (5500 Degree K). Great on strong overcast days or when you subject is in the heavy shade.• When shooting portraits and you want to give the skin tone a sun-kissed warm look.• You are shooting at sunrise or sunset with daylight-balanced film (5500 Degree K) and you want to a really warm looking scene.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.