Tiffen 4x4" Low Light Dispersion Glass Filter (LLD)

The Tiffen 4 x 4" Low Light Dispersion Glass Filter is popular with cinematographer's.

The Low Light Dispersion filter (LLD) is the same shade as a traditional yellow #85 filter (The #85 series will produce natural colors when shooting with tungsten film outdoors).  However, it is used instead of the #85 in low light scenarios since it does not require the 2/3 stop light loss of the #85.

This filter opens up shadows while adding a noticable warmth to the image.