NiSi Square Nano IRGND Hard 100x150mm GND8 0.9

NiSi Square Nano IR GND Hard 100x150mm – Infrared protection and clear horizon separation

The NiSi Nano IR Hard Graduated Neutral Density (GND) filter in 100x150mm format gives landscape photographers control when a scene has a clear boundary between bright and dark areas. It delivers a hard edge transition so you can balance exposure across defined separations, such as the horizon line between sea and sky. Additionally, NiSi added an infrared protection coating to reduce unwanted infrared color cast when shooting at small apertures.

Designed for defined horizons and strong transitions

Hard GND filters create an obvious, sharp boundary between the transparent and dark areas of the filter. Therefore, photographers use them when the separation between light and shadow in a scene is well defined. For example, you can place the dark portion over a bright sky while keeping the foreground properly exposed. The hard edge makes it easy to align the filter with lines such as the horizon at sea.

Optical quality and coatings

NiSi builds this filter from high quality optical glass rather than resin. The glass carries a nano coating to preserve fine detail and reduce reflections. Furthermore, the filter includes an infrared protection coating layer that helps eliminate infrared light entering the lens and reduces unwanted red color cast when shooting at small apertures. The nano coating is applied on both sides and also provides water and oil repellency for easier cleaning in the field.

Color neutrality and usage

The NiSi Nano IR Hard GND is a neutral density filter, so it does not affect the coloration of your image. You can reposition the filter inside a compatible holder, which allows you to recompose the shot after placing the filter to get the best framing and exposure balance. This repositioning makes the filter practical for varied landscape compositions where the horizon or bright area may not be centered.

Available stops and sizes

This NiSi Nano IR Hard Graduated ND filter in 100x150 mm is available in the following maximum effect aperture 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)

Technical specifications

FAQ

Question: When should I choose a Hard GND instead of a Soft or Reverse GND?
Answer: Choose a Hard GND when the boundary between bright and dark areas is distinct, for example a straight horizon over the sea. The hard edge matches well with sharp separations, whereas soft or reverse GNDs suit uneven or gradual transitions.

Question: How does the infrared protection coating affect my images?
Answer: The infrared protection coating reduces infrared light passing through the lens, which helps prevent unwanted red color cast that can appear when using neutral density filters at small apertures. This preserves more natural colors in your final image.

Question: Can I reposition this filter after mounting it?
Answer: Yes. The filter can be repositioned in a compatible holder, allowing you to recompose and fine-tune the placement of the dark/clear boundary for the best exposure balance and framing.

Question: Does the filter change color or reduce image quality?
Answer: No. The filter is neutral density and does not affect image coloration. It is made from high quality optical glass with nano coatings to maintain high definition and minimize color cast and reflections.