Using NiSi Cinema 6.6x6.63 Soft-Edge Graduated ND Filters

By NiSi Filters Australia | Published: 2026-10-22

Category: Product Reviews

Learn how to use NiSi Cinema 6.6x6.63 soft-edge graduated ND filters to balance exposure in landscape and cinema shots, with step-by-step setup and common mistakes to avoid.

Quick Answer

Position the soft-edge transition over the horizon or hard edge in your frame to darken the sky while keeping the foreground properly exposed, then adjust your aperture or shutter speed to achieve the desired look.

Why Soft-Edge Graduated ND Filters Work for Cinema and Landscape

A soft-edge graduated ND filter transitions from dark to clear gradually, making it ideal for scenes where the horizon is uneven—like mountains, trees, or city skylines. The NiSi Cinema 6.6x6.63 filters use optical glass with Nano IRND coating to reduce color cast and infrared pollution, keeping your footage neutral. Unlike hard-edge grads, the soft edge avoids a harsh line, blending naturally with the scene.

Choosing Between 3-Stop and 4-Stop

The NiSi Cinema 6.6x6.63 range offers 0.9 (3-stop) and 1.2 (4-stop) densities. The 3-stop version is a good starting point for golden hour or overcast skies, while the 4-stop suits bright midday scenes or when you want a wider aperture for shallow depth of field. If you often shoot variable lighting, consider carrying both.

Step-by-Step Setup and Use

1. Mount the Filter: Slide the NiSi Cinema 6.6x6.63 filter into your 6.6x6.6” matte box or holder slot closest to the lens. Ensure the filter sits flat and parallel to the lens element to avoid vignetting or soft focus. Common mistake: inserting the filter backward. The gradient should darken the top portion of the frame.
2. Compose and Set Exposure: With the filter in place, meter the foreground (the area you want properly exposed). Adjust your aperture and shutter speed to achieve that exposure. The sky will appear darker naturally. For cinema, use a waveform monitor to confirm the sky stays within your desired IRE range. Checkpoint: Do not meter through the filter—it will give false readings for the bright area.
3. Fine-Tune the Transition Position: Slide the filter up or down in the holder to align the soft edge with the brightest part of the horizon. Because the edge is soft, you can place it slightly above or below the horizon to hide the transition in texture or shadow. Common mistake: placing the transition exactly on a straight horizon line—soft edges work best when blended into irregular detail.
4. Adjust for Desired Effect: If the sky is still too bright, use a higher density filter (e.g., 4-stop instead of 3-stop) or stop down your aperture. For a shallower depth of field, open the aperture and use a higher ND density to maintain the same shutter speed or frame rate. Checkpoint: Ensure your shutter angle or speed matches your frame rate to avoid flicker in video.

Product Details

NiSi Cinema 6.6×6.6” Nano IRND Soft-Edge Graduated 1.2 Filter (4 Stop): Soft-edged transition for gradual exposure reduction across the frame. This allows you to darken bright skies without a visible line, even over irregular horizons like treelines or rooftops.
NiSi Cinema 6.6×6.6” Nano IRND Soft-Edge Graduated 1.2 Filter (4 Stop)
NiSi Cinema 6.6×6.6” Nano IRND Soft-Edge Graduated 0.9 Filter (3 Stop): 3-stop (0.9) density reduces light by three f-stops in the darkened area. Ideal for balancing a bright sky with a darker foreground during sunrise or sunset without losing detail in either zone.
NiSi Cinema 6.6×6.6” Nano IRND Soft-Edge Graduated 0.9 Filter (3 Stop)