The Singh-Ray 82mm Variable ND Filter screws onto the front of lenses that have filter threads and are 82mm in diameter. This filter is threaded at both ends for stacking with other filters. It is 14.2mm thick and will vignette when shooting at wide angles.

This filter will darken your entire scene by 2-8 stops and is useful for shooting longer exposures and/or wider apertures in bright conditions with less overexposure risk. It's used primarily for longer exposures of water but has a lot of functional uses for portraits, sports, and more. When using this filter, it's best to set it at "Min" for ease of framing and focusing before rotating the filter for darker results.