The Singh-Ray 77mm Thin Mor-Slo Solid Neutral Density 4.5 Filter with Front Filter Threads is an ND filter with a 32,000x filter factor that provides a 15-stop exposure reduction. Its 4.5 density creates a darkening of the entire image, allowing you to photograph with a wider aperture or slower shutter speed than normally required. By slowing your exposure time or increasing your aperture, you can control depth of field and convey movement more easily. Neutral density filters do not affect the coloration of the image and are ideal for pairing with other filters.
This Singh-Ray neutral density filter is constructed from optical glass and features a thin, 4.6mm aluminum alloy filter ring for durability which also minimizes the potential for vignetting while remaining lightweight. The filter ring also includes 77mm front threads that allow for use with other filters that have 77mm rear threads.