The HOYA Variable Density II is an adjustable density filter with an ND range from 1.5 to 9 f-stop (ND3-400).

The difference from the previous HOYA variable density filter is the newly designed rotating frame with a convenient button, allowing for better operation.

Variable density filters are widely used because they can replace a set of solid ND filters, providing a density range that can be adjusted according to the desired exposure settings.

When shooting, variable density filters reduce the shutter speed according to the photographer's intentions when the shutter speed cannot be decreased due to the camera's limitations.

Variable density filters can also enhance the amount of bokeh when shooting in excessively bright conditions, thus preventing overexposure of the image.

When shooting video, it is essential to keep the shutter speed adjusted to match the frame rate setting, that is, equal to double the frame rate for optimal results. This is because an excessively fast shutter speed can create a jittery effect.