<ul><li>Singh-Ray 77mm Vari-ND Filter you can 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.</li></ul> Vari-ND Variable Neutral Density (ND) Filters 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. 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

Singh-Ray 77mm Vari-ND Neutral Density Filter