Neutral Density Variable Filter K&F SB7473 — adjustable ND3 to ND1000, full-frame compatible, screw-mount

The K&F Neutral Density Variable Filter SB7473 provides adjustable light reduction in one screw-mount unit, covering a continuous range from approximately ND3 to ND1000. Engineered for full-frame compatibility, this variable ND filter allows photographers to control exposure and motion without changing aperture or shutter settings, making it suitable for landscape, cityscape, and creative long-exposure work. The filter attaches directly to compatible screw-mount lenses and offers a compact solution for reducing incoming light in bright conditions or when slower shutter speeds are required.

Advantages

This variable ND filter delivers a wide attenuation range in a single piece of glass, eliminating the need to carry multiple fixed-density filters. Its screw-mount design ensures secure attachment and easy swapping on lenses with matching thread sizes. Full-frame compatibility preserves image coverage and avoids vignetting on wide-angle lenses when used within the filter's intended range. The adjustable density enables precise control over exposure and motion blur while maintaining optical alignment and framing.

Suitable for

• Landscape and seascape long-exposure photography
• Urban and architectural motion blur effects
• Portraits in bright sunlight where wider aperture is desired
• Video production requiring consistent exposure control and shallow depth of field
• Creative photography techniques that use slow shutter speeds

Key specifications

• Adjustable light reduction range: approximately ND3 to ND1000
• Mount type: screw-in filter thread (compatible with lenses of matching thread size)
• Compatible image format: full-frame sensors
• Function: variable neutral density for continuous light attenuation
• Primary use cases: exposure control, motion blur, long exposures, depth-of-field management

How to use

Screw the filter onto the lens thread of a compatible lens, ensuring the filter is clean and free of dust or fingerprints before attachment. Rotate the front element to change the density and monitor exposure using the camera’s meter or live view; adjust ISO, aperture, and shutter speed as needed to achieve the desired effect. For very long exposures, use a stable tripod and, if available, a remote release or camera timer to avoid camera shake. When composing wide-angle shots, check for vignetting at extreme settings and reduce density or stop down if necessary.

Usage recommendations

Use the SB7473 variable ND in moderate to bright light for smooth exposure control; test the filter at different rotation positions before critical shoots to identify any potential cross-polarization artifacts. Clean both sides of the filter with appropriate optics-safe materials and store it in a protective case when not in use.