Filter transmittance refers to the percentage of light that is able to pass through the filter. For ND filters and polarizing filters, this property is crucial because it determines how much light will be on the camera's sensor and how it will affect the overall exposure of the photo. Higher transmittance means more light and a brighter image, while lower transmittance leads to darker results. This is important for photographers who work in a variety of lighting conditions and need to maintain a consistent exposure.
EV, or exposure value, affect, is the amount by which the filter changes the exposure of the image. Higher EV filters allow the photographer to use a longer exposure or larger aperture to achieve the desired depth of field or motion effect. This exposure control is essential in situations where specific creative techniques are needed, such as long exposures in the daytime.
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