The Schneider Optics 68-884408 95mm Landscape Variable Neutral Density Upgrade Kit allows you to create a variable neutral density filter using the 68-885603 Landscape Control Kit.
The kit comprises a screw-on 95mm True-Match Circular Polarizer (Non-Rotating) that mounts to the front of the camera lens and a 4 x 4 True-Match Linear Polarizer, which attaches to the 4mm slots on the 4" Filter Holder of the Landscape Control Kit (not included).
This carefully matched set of filters works in combination to produce varying densities ranging from 1-1/3 to 11 stops of light loss. Made of excellent quality materials, this Variable ND Filter Kit offer 11 stops (ND3.3) attenuation with no blue color shift at the maximum density.
An anomoly may occur when using a Variable ND filter when shooting wide angle (50mm and below) near to or at the highest ND point on the filter. The anomoly can be a very dark area in the center of the image, or an "X" pattern with lighter frame edges.
For optimal performance, we always recommend using these filters on manual exposure. Vari-ND filters are best used for video capture at any aperture or wide aperture, high shutter speed still shooting. Schneider Optics does not recommend Vari-ND filters for smaller aperture, long exposure still shooting.