Vari-ND Variable Neutral Density Filter
Add a dramatic new look to your work with motion effects and shallow depth of field, even in bright light or when using a flash.
Just turn the Vari-ND to control the amount of light passing through your lens, adding between two and eight stops of neutral density with no loss of color fidelity or sharpness. The Vari-ND is also a must-have filter for shooting video.
- Use a sturdy tripod and locking cable release.
- Open the Vari-ND to minimum density to compose and focus, dial in the desired density, then close your viewfinder shutter to minimize the chance of a light leak.
- Stack a Mor-Slo filter or LB polarizer on the Vari-ND for additional density increases and to reduce glare and enhance colors. Be alert to the possibility of vignetting with wide-angle lenses. At least one of the filters must also have a standard ring mount (to reduce thickness and minimize vignetting, our thin-mount filters do not have outside threads).
- For best results, always use the Vari-ND within its 2-8-stop exposure range.
- Some photographers who regularly shoot at very wide angles find it helpful to use a larger filter and a step-up ring.
How the Vari-ND slows down your shutter speed in a typical daylight scene
|Without filter||1/500 sec. at f8|
|Vari-ND at minimum density (2 stops)||1/125 sec. at f8|
|Vari-ND at middle density (5 stops)||1/15 sec. at f8|
|Vari-ND at maximum density (8 stops)||1/2 sec. at f8|
|Close your aperture for even slower shutter speeds||1 sec. at f11|
|2 sec. at f16|
|4 sec. at f22|
Source : www.singh-ray.com