NiSi Square Filter Explorer 150x170mm Reverse GND4

NiSi Square Filter Explorer 150x170mm Reverse GND4 – 2‑Stop Reverse Graduated Neutral Density on Hardened B270 Glass

This NiSi Explorer 150x170mm Reverse GND4 (0.6) reduces light by 2 stops and is built for active photographers who need a durable, high-quality graduated neutral density filter. It balances bright horizons with darker foregrounds while maintaining natural color rendition.

Key features

• Reverse graduated neutral density filter with the darkest area near the center of the filter, designed for scenes where light is strongest at the horizon.
• GND4 (0.6) provides a 2-stop light reduction to help even out exposure between sky and landscape.
• Made from B270 tempered glass that is hardened for extra durability; NiSi states this makes them twice as durable as typical glass filters.
• Includes an IR coating and NiSi’s Nano coating that repels dirt, water and oil, helping to keep the filter cleaner in the field.
• Compatible with the NiSi 150mm filter system.

When to use this Reverse GND4

Use the NiSi Reverse GND4 when the brightest area of your scene lies along the horizon and fades upward into the sky. Typical examples include seascapes and open landscapes where no elements rise above the horizon line. In these situations, the reverse grad helps you reduce overexposure near the horizon while retaining detail and color above and below.

Coatings and color neutrality

The filter does not affect the coloration of the image and comes with an IR coating. In addition, it uses NiSi’s Nano coating, which repels dirt, water and oil similar to NiSi’s regular filters. These treatments support consistent color and cleaner surfaces when shooting outdoors.

Durability and handling note

NiSi Explorer filters undergo a tempering and hardening process to make them much less prone to accidental damage compared to untreated glass. However, they are not unbreakable. Over time, the hardening effect may decline. Handle the filter with care and be aware that eventual wear is possible despite the enhanced durability.

Compatibility

This 150x170mm filter is designed to work with the NiSi 150mm filter system. Ensure your holder or adapter accepts 150x170mm square filters for correct fit and function.

Specifications

FAQs

question: What does "Reverse GND4 (0.6)" mean?
Answer: It indicates a reverse graduated neutral density filter with a density value of 0.6, commonly referred to as GND4, which reduces light by 2 stops. The darkest area is centered along the filter near the horizon to control bright horizon light.

question: Will this filter change the colors in my image?
Answer: No. According to the product information, the filter does not affect image coloration and includes an IR coating to maintain color neutrality.

question: How durable is the NiSi Explorer glass?
Answer: The Explorer series uses B270 tempered glass that NiSi states is twice as durable as typical glass filters due to a tempering and hardening process. Nevertheless, the filter is not unbreakable and the hardening effect can diminish over time.

question: Is this filter suitable for seascapes and open horizons?
Answer: Yes. The reverse graduation is intended for scenes where the brightest area is along the horizon, such as seascapes and landscapes with no elements protruding above the horizon.

question: Which filter system does this fit?
Answer: This 150x170mm Explorer filter is compatible with the NiSi 150mm filter system.