Quite often when using a standard zoom lens in low light there is just not enough light for a minimum exposure. The 4x4 Tiffen LL-D (LLD) (Low-Light Dispersion) Filter can be used as an 85 substitution outdoors in low light when using tungsten based film. With no filter factor, the LLD filter will save you a 1/3 stop over that of an 85 filter.
The LLD filter, when used as an 85 substitute will enable the color timer to match the color of a properly 85 filtered original. Be sure that the camera assistant makes a notation of the LLD filter on the slate and camera report.
There's also a great thread on the
CML message board
CAT 44LLD
UPC Code: 049383018592