Half-format grey camera filter Massa SB621 — Cokin-compatible half filter

The Massa SB621 — Cokin-compatible half filter is a graduated neutral density (GND) filter in grey designed for use with Cokin-style filter holders. It delivers gradual attenuation from the top of the frame toward the center, allowing photographers to reduce exposure in bright areas such as skies while preserving detail and exposure in the foreground. The half-format design sits across part of the image, making it suitable for scenes with a clear horizon or a strong separation between sky and land or water.

Advantages

This Cokin-compatible graduated grey filter offers controlled darkening without introducing strong colour cast, enabling smoother exposure transitions between bright and dark areas. Its half-format gradient supports precise composition adjustments when used with a compatible holder. By balancing dynamic range in high-contrast outdoor scenes, the filter reduces the need for heavy post-processing and helps retain highlight detail in skies and reflective surfaces.

Suitable for

• Landscape photography with distinct horizon lines
• Seascapes, rivers and lakes where sky and water contrast with foreground
• Outdoor architecture shots with bright skies
• Situations requiring controlled highlight reduction before exposure

Key specifications

• Filter type: half-format graduated neutral density (grey)
• Compatibility: designed for Cokin-style filter holder systems
• Effect: graduated attenuation from top to center of the frame
• Primary application: exposure balancing in high-contrast scenes
• Form factor: rectangular half filter for slot-style holders

How to use

Install the Massa SB621 into a compatible Cokin-style filter holder and slide the filter vertically until the graduation aligns with the horizon or the transition area in your composition. Meter for the darker (foreground) or midtone areas and set exposure as needed; the filter will reduce light in the brighter portion of the scene. Fine-tune the filter position and camera angle to achieve a natural tonal transition. When shooting at low angles or with irregular horizons, consider using graduated filters with different transition types or combining this filter with other neutral density or polarizing elements in the holder.

Usage recommendations

Use the filter when capturing scenes with a clearly separated sky and foreground. For wide dynamic range situations, bracket exposures or shoot in RAW to preserve maximum detail. Clean the filter with a soft microfiber cloth and keep the holder slots free of dust to avoid uneven exposure or marks on the image.