Pancro's custom filter, the custom NDGrad graduates from the filter's edge to clear with a blend line of hard, soft, or razor sharp. The graduation size may be varied to any specification you need, such as 1/4", 1/2", 3/8", 1", or 1 1/4." The graducation placement also may be specificed wherever you need it on the filter. In general, any NDGrad may be placed at 1/3 down for graduation. A Standard Hard ND graduates 1/4" while the Standard Soft ND graduates 1". The Razor Sharp has no graduation but a razor sharp edge. Available in .3, .6, .9, 1.2, and 1.5 densities and in all standard sizes, including 4 X 5.650 and 6.6 X 6.6.
The NDGrad is used for light exposure control to tone-down scenes where there is intense brightness. The ND section is placed on top for bright skies or on bottom for glaring snow, sand, or water. The NDGrad is also used in dusk-for-night shots where a dimly-lit sky appears as night. It is often used in combination with other filters in a rotating filter holder in a matte box, where the ND Grad should always be placed in front.