NiSi Square Nano IRGND Reverse 150x170mm GND4 0.6

NiSi Square Nano IRGND Reverse 150x170mm GND4 0.6 – Reverse Graduated ND for Sunrises and Sunsets

This NiSi Square Nano IRGND Reverse filter in 150x170mm format is designed specifically to help landscape photographers manage strong horizon light during sunrises and sunsets. The filter uses a reverse graduated neutral density design: the darkest area sits near the center of the filter and gradually clears toward the top, while the bottom remains clear to avoid overexposing the skyline.

How the reverse GND works

Reverse graduated ND filters have a hard edge where the dark area transitions, but the density fades as you move from the separation line toward the top of the filter. As a result, they handle situations where the brightest light is concentrated around the horizon line, such as sunrise and sunset scenes. You can reposition this filter in the holder to recompute framing and align the graduated area with the horizon for the best exposure balance.

Key material and coatings

The filter is made from high-quality optical glass (not resin). NiSi applies a nano coating to both sides to protect image detail and to repel water and oil. In addition, the filter includes an infrared protection coating that helps reduce the unwanted red cast that can appear when shooting with neutral density filters at small apertures.

Available densities

This Reverse Nano IR Graduated Neutral Density filter from NiSi in size 150x170 mm is available in the following maximum effects:

• 2 stop (0.6)
• 3 stop (0.9)
• 4 stop (1.2)

Features at a glance

• Ultra Low Color Cast, Ultra Low Reflection
• No Vignetting
• High Definition
• Nano Coating on Both Sides, Water & Oil Repellent
• Environmental Optical Lens glass (H-K9L)

Specifications

Practical use cases

Use this reverse GND when the brightest light sits on or near the horizon, such as during sunrise and sunset. Because the highest density sits near the center, it reduces overexposure at the horizon while keeping foreground detail intact. Also, you can slide and reposition the filter within a holder to align the graduated area precisely with the horizon or other bright bands in the scene.

FAQ

Question: Will this filter change the color of my image?
Answer: Neutral density filters do not affect the coloration of the image. Additionally, the nano and infrared protection coatings help preserve natural color by reducing color cast, including infrared-induced red casts when shooting at small apertures.

Question: Can I use this with a filter holder and reposition it?
Answer: Yes. The NiSi reverse GND can be repositioned in a compatible filter holder, allowing you to recompose and align the graduated zone with the horizon or other elements in your frame.

Question: Is the filter made of glass or resin?
Answer: This filter is made from high-quality optical glass (H-K9L), not resin, which helps retain fine detail and optical performance.

Question: What coatings does the filter have and why do they matter?
Answer: The filter features nano coatings on both sides for water and oil repellence and low reflection, plus an infrared protection coating to reduce unwanted infrared red casts. These coatings protect the surface and help maintain image clarity and natural colors.