The Hoya 72mm Variable Density Ii Filter is a high-quality, adjustable density filter that offers a versatile Nd range from 1.5 to 9 f-stops (ND3-400). This professional-grade filter is an upgrade from the previous Hoya Variable Density model, featuring a newly designed rotatable frame with a convenient knob for enhanced operation. Variable Density Filters are essential tools for photographers and videographers alike. They offer the flexibility to replace a set of solid ND filters by providing an adjustable range of density, tailored to your desired exposure settings. In still photography, these filters allow you to lower the shutter speed according to your creative intentions, even when camera limits prevent a lower shutter speed. They also increase the amount of bokeh in over-lit conditions, preventing image overexposure and enhancing the overall image quality.In video shooting, maintaining the correct shutter speed to match the frame rate setting is crucial. The Hoya Variable Density Ii Filter allows you to adjust the shutter speed to double the frame rate for optimal results, avoiding the jarring effect and afterimages that can occur with excessively fast shutter speeds. The Hoya Variable Density Ii Filter incorporates an exclusive rotatable frame construction, consisting of a fixed frame and a rotatable frame. This design minimizes the risk of vignetting when used on wide-angle lenses. However, please be aware of the potential for vignetting with Aps-c size wide-angle lenses at focal lengths less than 13mm and Full Frame wide-angle lenses at focal lengths less than 24mm. Due to its specific structure, the Hoya Variable Density Ii Filter can accommodate a lens cap one size larger than the filter itself. For example, a 77mm Hoya Variable Density Ii can take an 82mm lens cap. This durable filter provides the freedom to change the shutter speed for longer exposures without altering the aperture, making it ideal for creating motion blur effects like waterfalls, cars, or blurred panning movement. It also allows for wider apertures in over-lit conditions, decreasing depth-of-field and focusing attention on the subject. The Hoya Variable Density Ii Filter is an invaluable tool for preventing overexposure. Even with a shutter speed of 1/8000 seconds, a large aperture of f/1.4 or f/1.2 can cause overexposure. This filter allows you to adjust the light intake, avoiding overexposure issues. For video bloggers and professional video content creators, the Variable Density Filter is a must-have. It allows cine/video cameras to set the appropriate exposures in bright lighting conditions, achieving a cinematic look. With the Hoya Variable Density Ii Filter, you gain control, versatility, and efficiency in your photography and videography endeavors..