Offering increased control over exposures, the Pro 145mm Ultra Slim ND 3.0 Filter from Fotodiox is a neutral density filter used to darken the entire image, thereby allowing you to increase exposure times or work with a wider aperture setting than usually required. By slowing your exposure time or increasing your aperture, you are able to control depth of field and convey movement more easily. The ND 3.0 density of this filter requires a 10-stop increase in exposure to achieve a normal exposure.
The filter is made from optical glass, which has been multi-coated to maintain image quality when working in strong lighting conditions. The glass is set in a 3mm-thick anodized aluminum ring that is lightweight, durable, and slim to help prevent vignetting when used with wide-angle lenses.