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This is Tiffen's 10-Stop ND Filter - recently remarketed as the AXent
The Tiffen ND 3.0 is a Neutral Density filter providing 10-stop exposure absorption. The high density blocks light emission of the visual spectrum into the camera, allowing you to photograph with a much slower shutter speed or at a wider aperture than required. This gives the photographer two techniques; the filter is ideal then for long exposures in which anything with movement in the image is desired to appear blurred. The second is in which the photographer needs to use faster or more wide open lens apertures to create less depth of field.
- Reduces amount of light passing through camera lens without changing color of scene.
- Especially useful in bright light conditions to help prevent overexposure; balances exposure
- Eliminates overly bright, washed-out images
- Controls depth-of-field
- Allows slower shutter speeds to produce blurred motion effects
As per the description this filter operates in the visual spectrum - if you are using it on a digital camera which has poor internal infrared filtering you may need an IR ND filter or an IR ND HM (Hot Mirror) rather than an ND filter.
Also available in densities .3, .6 ,.9 and 1.2 - These correspond to 1, 2 , 3 and 4 stops light reduction respectively and are sometimes represented as ND2, ND4, ND8 and ND16.
Also available in a Graduated Neutral Density .6 filter for landscapes.
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