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Neutral dark glass


    Attenuator (in the gray density of mirror) can only function is to reduce the amount of light entering the camera, and will not weaken the shade of a much weakened on other less shade. Its purpose is to weaken all the light, changing only the film exposure, and the relative brightness of the scene does not have any impact on value. We can mirror changes in the gray density of the brightness of the light to varying degrees to adjust film exposure, the effect is equivalent to shrink 1 block, 2 block, 3 block or more block aperture. Of course, this does not mean that adjusting the camera aperture to alternative attenuator, such as in extreme circumstances, in the case of very strong light, the attenuators will be on the aperture, exposure time to adjust with greater flexibility.

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