Neutral density filters, also known in astronomy as Moon filters, are another approach for contrast enhancement and glare reduction.
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With color film or video, a graduated neutral density filter can achieve a similar effect, as can a polarizing filter.
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Neutral density filters are mainly used in traditional photography, but are used in astronomy to enhance lunar and planetary observations.
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Then once you are happy with the composition, switch to manual focus and put the neutral density filter back on.
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As a long time user of their graduated neutral density filters, Formatt Hitech named Chris a " Featured Artist ".
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The probe beam can be made of a reflection of the pump beam passed through neutral density filter to reduce its intensity.
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Neutral density filters are darkened with a neutral ( colorless ) gray tint which reduces the amount of light entering the camera lens.
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Long exposures are easiest to accomplish in low-light conditions, but can be done in brighter light using neutral density filters or specially designed cameras.
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The BOA introduces a neutral density filter to the optical path that attenuates the light by approximately a factor of one hundred ( five astronomical magnitudes ).
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A graduated neutral density filter can be also used to improve the reproduction of the exposure range of the scene, by darkening bright parts of the image.
