NiSi Square Nano IRGND Reverse 180x210mm GND8 0.9

NiSi Square Nano IRGND Reverse 180x210mm GND8 0.9 – Reverse Graduated ND for Sunrise and Sunset Scenes

The NiSi Reverse Nano IR Graduated Neutral Density Filter 180x210mm GND8 0.9 is designed for landscape photographers who photograph sunrises and sunsets. It places the darkest area near the horizon and fades toward the top, which helps manage the stronger light at the horizon line during those times of day.

Purpose and design

This reverse GND is a variation of a hard-edge graduated neutral density filter. However, unlike a standard hard-edge GND, the dark section sits around the center and gradually becomes clearer toward the top of the filter. The bottom area remains clear, which prevents overexposure of the skyline and foreground.

Because of this design, the filter helps balance the intense light on the horizon—typical in sunrise and sunset photography—while preserving detail above the horizon line.

Construction and optical quality

NiSi makes this filter from high-quality optical glass (not resin). The glass is specified as Environmental Optical Lens glass (H-K9L), and NiSi applies a nano coating to both sides. This nano coating helps preserve image detail and provides water and oil repellency, making the filter easier to clean in the field.

In addition, NiSi adds an infrared protection coating layer to this filter. This layer helps reduce unwanted infrared light that can cause a red cast when shooting at small apertures, restoring more natural color in such situations.

Key features

• Reverse graduated neutral density design: dark area centered near the horizon and fades toward the top.
• Specifically intended for sunrise and sunset landscape photography.
• Made from high-quality optical glass (not resin).
• Nano coating on both sides for detail retention and durability.
• Infrared protection coating to reduce red color cast caused by infrared light.
• Water and oil repellent surface for easier cleaning and field use.
• Ultra low color cast and ultra low reflection to maintain image fidelity.
• No vignetting and high definition performance as stated by the manufacturer.
• Can be repositioned in a filter holder to recompose and fine-tune the balance in the frame.

How to use

Fit the 180x210mm filter into a compatible NiSi holder. Then slide the filter up or down to align the dark band with the horizon or area of strongest light. Because the filter is repositionable, you can recompose the scene while keeping the light balanced across the frame.

Use the infrared protection coating when shooting at small apertures to help prevent the infrared red cast that neutral density filters can sometimes introduce.

Technical specifications

FAQ

Question: When should I use a reverse GND filter?

Answer: Use a reverse GND when the brightest light is at or near the horizon, such as during sunrise and sunset. The dark band near the center helps balance that intense horizon light while preserving detail above and below.

Question: Will this filter change the color of my image?

Answer: Neutral density filters do not affect the coloration of the image. Additionally, this NiSi filter features ultra low color cast and an infrared protection coating to reduce any infrared-induced red cast at small apertures.

Question: Can I reposition the filter while composing?

Answer: Yes. The filter can be slid and repositioned in its holder, allowing you to recompose the frame and fine-tune the placement of the dark band relative to the horizon.

Question: Is this filter made of glass or resin?

Answer: The filter is made from high-quality optical glass (not resin), specified as Environmental Optical Lens glass (H-K9L), with nano coatings on both sides for protection and clarity.