The Tiffen 40.5mm ND 1.2 Filter (4-Stop) density rating of 0.6 uniformly darkens the entire frame, affording you the flexibility to capture images with a wider aperture or a slower shutter speed than typically needed. Adjusting your exposure time or aperture grants you precise control over depth of field and facilitates the conveyance of motion in your shots. Importantly, neutral density filters like this one maintain the image’s natural coloration, making them an excellent choice for use alongside other filters in your photography toolkit.This Tiffen 40.5mm ND 1.2 Filter (4-Stop) is made using ColorCore technology, a process that involves laminating the filter substrate between 2 pieces of optical glass, grinding flat to a tolerance of 1/10,000th of an inch, and then mounting to precision metal rings.The 0.6 neutral density filter darkens the image, allowing you to photograph with a longer shutter speed or wider aperture than normally required.Providing a 2-stop exposure reduction, this filter allows you to control depth of field and convey movement more easily.Filter does not affect coloration of the image and is ideal for use with other filters.Front filter threads allow for use with other filters.Plastic filter case for storage and transport.