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Neutral-density filter
Videos
In photography and optics, a neutral-density filter, or ND filter, is a filter that reduces or modifies the intensity of all wavelengths, or colors, of light equally, giving no changes in hue of color
A demonstration of the effect of a neutral density filter. Note that the photograph was exposed for the view through the filter, and thus the remainde
A demonstration of the effect of a neutral density filter. Note that the photograph was exposed for the view through the filter, and thus the remainder of the scene is overexposed. If the exposure had instead been set for the unfiltered background, it would appear properly exposed while the view through the filter would be dark.
A set of ND filters
A set of ND filters
Comparison of two pictures showing the result of using an ND filter at a landscape. The first one uses only a polarizer, and the second one a polarize
Comparison of two pictures showing the result of using an ND filter at a landscape. The first one uses only a polarizer, and the second one a polarizer and a 1000× ND filter (ND3.0), which allowed the second shot to have a much longer exposure, smoothing any motion.
Neutral-density filters are often used to achieve motion-blur effects with slow shutter speeds.
Neutral-density filters are often used to achieve motion-blur effects with slow shutter speeds.
Welding helmet
Videos
A welding helmet is a piece of personal protective equipment used by welders to protect the user from concentrated light and flying particles. Different welding processes need stronger lens shades wit
Neutral-density filter
…the fractional transmittance is sometimes used (eclipses). Notation Lens area opening, as fraction of the complete lens f-stop reduction (approx.) ANSI shade (approx.) Fractional transmittance Optical density ND.number ND1number NDnumber 0.0 1 0 — 100% 1 0.3 ND 0.3 ND 101 ND2 1/2 1 1.7 50% 0.5 0.6 ND 0.6 ND…
A welding helmet in use
A welding helmet in use
Trainees wearing protective goggles while learning to weld (1943)
Trainees wearing protective goggles while learning to weld (1943)
Oxyfuel welding goggles
Oxyfuel welding goggles
Speedglas welding helmet
Speedglas welding helmet