Neutral Density Filter Set K&F SB9521 — 4-in-1 ND4 ND8 ND16 ND32 for GoPro Hero 9/10/11/12/13

K&F SB9521 is a 4-in-1 neutral density filter set designed specifically for GoPro Hero 9, 10, 11, 12 and 13 action cameras. The kit contains four screw-on ND filters — ND4, ND8, ND16 and ND32 — that reduce incoming light by approximately 2, 3, 4 and 5 stops respectively. These filters enable smoother motion rendering, more accurate exposure control in bright environments, and controlled motion blur for cinematic footage when using the fixed-lens, high-frame-rate capture of compatible GoPro models.

Advantages

The K&F SB9521 ND set provides precise attenuation of light without affecting color balance, allowing consistent white balance and image fidelity. Each filter is designed for secure attachment to compatible GoPro housings or mounts and offers optical-grade glass for clear, distortion-free results. The four-step density range covers common outdoor and water-based scenarios, reducing the need for constant ISO or shutter adjustments and enabling creative control over shutter speed and frame blending.

Suitable for

• Bright outdoor filming such as beaches, snow, and deserts
• Water sports and action scenes where highlights need control
• Cinematic motion blur at standard video frame rates
• Time-lapse sequences in strong daylight
• High-frame-rate capture when preventing overexposure

Key specifications

• Filter types: Neutral density (ND) — ND4, ND8, ND16, ND32
• Light reduction: approximately 2, 3, 4 and 5 stops respectively
• Compatibility: designed for GoPro Hero 9, 10, 11, 12, 13 action cameras
• Optical material: multi-coated optical glass for reduced reflections and improved light transmission
• Mounting: screw-on / snap-fit design compatible with appropriate GoPro lens housings or filter adapters
• Finish: anti-reflective coatings to preserve contrast and color fidelity

How to use

Choose the ND filter that matches the desired exposure reduction for the shooting conditions and attach it securely to the compatible GoPro housing or lens adapter. Use ND4/ND8 for moderately bright conditions and ND16/ND32 for very bright scenes or when you need pronounced motion blur. After mounting, frame and set the camera exposure and shutter speed according to the creative intent; verify focus and white balance on the camera display. Remove and store filters in their protective case when not in use to avoid scratches and contamination.

Usage recommendations

For beach, snow, or desert environments start with ND16 and switch to ND32 in direct sunlight with minimal cloud cover. For water sports where rapid lighting changes occur, carry ND4 and ND8 for quick swaps. Clean filters with a microfiber cloth and lens-safe solution and avoid touching the glass surface to maintain optical performance.