The Letus35 Variable ND / Color Temp Filter Kit is a unique kit containing two separate filters, but able to provide three distinct effects: a standard circular polarizer, a variable neutral density filter, and a color temperature modification filter. The two included filters are essentially a deconstructed variable ND filter; one measures 138mm in diameter and the other is a rectangular 4 x 5.65", which are compatible with standard matte box configurations.
The 138mm circular filter is a standard circular polarizer on its own and features an indexed filter ring for noting points of rotation. This is especially helpful as it is an objective tool for repeating the same settings from shot to shot. When this filter is paired with the rectangular filter, it becomes a standard variable ND filter with values from 0.4 to 2.7 (1.3 to 9 stops). You are able to dial in different ND values depending on how much or how little you rotate the filter. For the color temp filter, you simply flip one of the individual filters over and control the color of the scene by rotating. This is ideal for modifying color balance between warm and cool casts and works more fluidly than working with the camera's white balance or modifying imagery in post-production.
These filters are both constructed from high grade German optical glass to ensure consistent image quality and light transmission.