A variable neutral density (ND) filter is a type of camera filter that reduces the amount of light entering the lens, allowing for greater control over exposure and depth of field. Unlike fixed ND filters, which have a set level of light reduction, variable ND filters allow the user to adjust the amount of light reduction, making them suitable for a wider range of shooting conditions.
Variable ND filters are particularly useful in situations where the lighting conditions are changing rapidly, such as when shooting outdoors on a sunny day. They can also be used to create creative effects, such as blurring motion or creating a shallow depth of field. Variable ND filters are typically made of high-quality optical glass and feature a rotating ring that allows the user to adjust the amount of light reduction. They are available in a variety of sizes and can be attached to the front of the lens using a filter adapter ring.
