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The Letus35 4 x 5.65" Color Temp/ND Fader Filter complements a polarizer filter and, when used in conjunction, will produce either variable color temperature or variable neutral density effects. The orientation of this filter will determine which of the two effects occurs.
This filter must be used together with a polarizer filter; it has no specific functionality of its own.
Variable Neutral Density Filter
When used as a variable neutral density filter, it is capable providing an exposure reduction of about 1.3 to 9 stops. The 1.4 to 2.7 density creates a darkening of the entire image, allowing you to photograph with a wider aperture or slower shutter speed than would normally be required. The degree of density is easily controlled by rotating one of the filter substrates, allowing you to visualize the additional exposure length required. By slowing your exposure time or increasing your aperture, you are able to both control depth of field and amount of movement conveyed more easily.
Color Temperature Adjustment Filter
When used as a color temperature adjustment filter it functions similarly to a variable ND filter, however instead of controlling the density you are modifying the color temperature by rotating one of the filter substrates. This allows you to dial in differing amounts of warmth or coolness depending on your shooting situation or for creative effects. Working with this system is more intuitive and fluid in regard to a workflow as compared to modifying the white balance settings in your camera or spending excess time manipulating color during post-production.