NiSi Square Nano IRGND Hard 100x150mm GND4 0.6

NiSi Square Nano IR GND Hard 100x150mm GND4 0.6 – Hard Graduated ND for clearly defined horizons

The NiSi Nano IR Hard Graduated Neutral Density (GND) filter in 100x150 mm format gives landscape photographers a precise way to balance bright and dark areas when the transition between them is distinct. It produces a clear, hard edge between the darkened and transparent zones, making it suitable for scenes with well-defined boundaries such as horizons between sea and sky.

Key characteristics

This filter is made from environmental optical lens glass (H-K9L), not resin, and it carries NiSi’s nano coatings. As a result, it maintains high definition and minimizes color shifts. Furthermore, NiSi added an infrared protection coating to reduce infrared contamination that can cause unwanted red casts at small apertures.

When to use a Hard GND

Use a hard GND when the separation between bright and dark areas in your scene is obvious and straight. For example, the horizon line at sea or a flat boundary between sky and land benefits from the distinct transition a hard GND provides. Because the filter’s dark and clear areas have a defined edge, you can control exposure precisely where you need it.

Practical handling and composition

The filter fits into a holder and can be repositioned within that holder. Therefore, you can move the dark-to-clear boundary up or down to recompose your image without changing your camera position. This flexibility helps you place the exposure transition exactly where it improves the final shot.

Optical performance and coatings

The NiSi Nano IR Hard GND uses high-quality optical glass with nano coating on both sides. The nano coating repels water and oil, and it helps preserve fine detail and contrast in your images. In addition, the filter is designed for ultra low color cast and ultra low reflection, which supports accurate color reproduction and reduces unwanted flare or ghosting.

Benefits summarized

• 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

Usage scenarios

Choose this NiSi Hard GND when you shoot seascapes, flat horizons, or scenes where the bright and dark areas meet in a defined line. The hard edge gives you a clear transition and helps preserve detail in both highlights and shadows. Because the filter minimizes color cast and reflection, it maintains the natural color and contrast of the scene.

Frequently asked questions

• Question: When should I choose a hard GND over a soft GND?
  Answer: Choose a hard GND when the boundary between bright and dark areas is distinct and straight, such as a sea horizon. The hard edge gives a precise transition that suits those defined separations.
• Question: Does this filter affect color or introduce vignetting?
  Answer: The NiSi Nano IR Hard GND is designed for ultra low color cast and ultra low reflection, and it is specified to produce no vignetting, helping preserve natural color and even illumination.
• Question: Can I reposition the filter after mounting it?
  Answer: Yes. The filter can be repositioned within a holder so you can recompose the shot and align the dark-to-clear transition where you need it.
• Question: How does the filter handle infrared contamination and small aperture shooting?
  Answer: NiSi added an infrared protection coating layer to this filter to help eliminate infrared light passing through the lens, which reduces the risk of unwanted red color casts when shooting at small apertures.
• Question: What materials and coatings are used on the filter?
  Answer: The filter uses environmental optical lens glass (H-K9L), not resin, and features nano coating on both sides that is water and oil repellent. These choices help maintain high definition and make the filter easier to manage in the field.