NiSi Square Nano IRGND Hard 150X170mm GND4 0.6

NiSi Square Nano IR GND Hard 150x170mm – Hard Graduated ND with Infrared Protection

This NiSi Square Nano IR GND Hard 150x170mm is a hard graduated neutral density (GND) filter designed for landscape photographers. It creates a clear, well-defined transition between the dark and transparent areas of your image, which makes it ideal for scenes with a strong, straight horizon line such as the boundary between sea and sky.

What this filter does

The filter reduces exposure in bright parts of the scene while leaving darker parts unaffected. Because it is a hard GND, you will see an obvious, sharp boundary between the darkened and clear areas. This precise separation helps you control contrast where the bright and dark areas are very defined.

Build and optical quality

NiSi made this filter from high quality optical glass, not resin. It features a nano coating that preserves fine detail and minimizes loss of image clarity. The filter is described as neutral density, which means it does not affect the coloration of your image.

Infrared protection

When you use neutral density filters, cameras can become vulnerable to infrared light, which may cast an unwanted red color in photos at small apertures. NiSi added an infrared protection coating layer to this filter to help reduce infrared contamination and restore natural color in your images.

Practical handling and composition

You can reposition this 150x170mm filter inside a compatible holder. That lets you recompose and align the transition with the horizon or other hard boundaries in your scene for the best result.

Available densities

The NiSi Nano IR Hard GND in 150x170mm is available in the following maximum-effect steps:

• 2 stop (0.6)
• 3 stop (0.9)

Key features

• 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

FAQ

Question: When should I choose a hard GND over a soft GND?
Answer: Choose a hard GND when the separation between bright and dark areas in your scene is clearly defined and straight, such as a sea horizon. The hard edge provides a sharp transition that aligns with those straight boundaries.

Question: Will this filter change the color of my photos?
Answer: No. This is a neutral density filter and it is designed not to affect the coloration of the image. Additionally, the infrared protection coating helps prevent red color casts caused by infrared light at small apertures.

Question: Can I adjust the filter position during shooting?
Answer: Yes. The 150x170mm filter can be repositioned within a compatible holder, allowing you to move the dark/clear boundary to match your composition and horizon placement.

Question: Is the filter durable and easy to clean?
Answer: The filter uses optical glass (not resin) and has nano coatings on both sides that are water and oil repellent, which helps protect the surface and makes cleaning easier.

Question: Which densities are available and how do they affect exposure?
Answer: This filter is available in 2 stop (0.6) and 3 stop (0.9) versions. Each step reduces the exposure in the bright area by the stated amount, allowing longer exposures or balanced exposures between sky and foreground.