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A filter that theoretically reduces the transmission of all colors of the visible spectrum. Therefore, it is "neutral" and does not discriminate. There are 3 types that I know of: plain, graduated (density varies across the filter) and filter wheel. They come in various strengths, reducing light transmission by one stop for each factor of 2. Therefore an ND8 filter will require a corresponding increase in exposure of 3 stops (2x2x2=8). They are usually used when the light is too strong to achieve the desired picture, or in cases where the lens type dictates that exposure be controlled by filtration instead of a physical aperture. NOTE: I used the word theoretically. Practical ND filters do not reduce all visible wavelengths 100% equally, and they MUST NOT BE USED AS EYE PROTECTION from the sun as they have little effect on ultra-violet radiation.

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16y ago

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What does a neutral density filter do to adjust the exposure of a camera?

A neutral density filter reduces the amount of light entering the camera, allowing for longer exposure times without overexposing the image.


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How can neutral density filters be effectively used to achieve the desired exposure in photography?

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