The Tiffen Variable ND Filter is a versatile tool that offers the convenience of multiple neutral density filters in a single device. It is primarily used as a photographic tool for controlling depth of field and exposure. The Variable ND is also popular in the video market due to its speed and ease of use, as it is compact, lightweight, and does not require additional accessories like a matte box.

It operates on the same principle as a circular polarizer, allowing rotation until the desired effect is achieved. It provides continuous control over the amount of light passing through the lens within a range of 2 stops (ND 0.6) to 8 stops (ND 2.4), while maintaining image integrity.