When buying a UV filter, several factors matter: optical quality, reflection control and, of course, light transmission. We analyzed recent measurement data and found that NiSi Air UV filters perform exceptionally well in these categories. But how do other brands compare? In this review, we take a detailed look at filter performance and explain why NiSi stands out as one of the best options.

Why is a UV filter important?

A UV filter serves multiple purposes: it reduces the impact of UV rays, prevents a blue color cast in images and protects the front glass of the lens. High-quality lenses especially benefit from a premium filter that does not negatively affect image quality. Low-quality filters can increase reflections, cause blurriness or even affect color accuracy. 

An ideal UV filter should offer high light transmission while minimizing unwanted reflections. This is where NiSi comes in.

Light Transmission Tested

The transmission property of a filter determines how much light actually passes through the glass. High light transmission is essential to avoid image quality loss caused by reflections or stray light. We took a closer look at the lab measurement results: 

NiSi Air UV-1: 99.718% transmission
NiSi Air UV-2: 99.756% transmission
Other brands: 99.571% transmission

What Do These Values Mean?

Even the smallest differences in light transmission can make a noticeable difference in real-world photography. The higher the transmission, the less light is lost, resulting in slightly better contrast and more accurate color reproduction.

High light transmission is especially important for photographers working in challenging lighting conditions, such as landscape photography. A filter with lower transmission values can make images appear darker or less vibrant.

NiSi stands out in this area with impressive values, ranking at the top of the scale.

Reflection Properties: Less Is More

In addition to light transmission, reflection is also crucial: the less light that is reflected, the better.

 Here are the measured values: 

NiSi Air UV-1 reflection: 0.00091%
NiSi Air UV-2 reflection: 0.00070%
Other brands: 0.00147%

Why Is Reflection Important?

Light that is reflected off the surface of a filter does not pass through the lens and can appear as stray light or ghosting in your images. This is especially noticeable in night photography or when there are light sources in the frame, such as the sun, street lamps, or car headlights. Poor anti-reflective coatings can lead to unwanted effects.

The values show that NiSi filters have significantly lower reflection compared to other brands. This means less stray light enters the lens, resulting in clearer and higher-contrast images.

Quality and Coating

NiSi uses a special nano-coating that not only reduces reflection but also increases the filter’s durability. Scratch resistance, water and oil repellency are key features, especially when the filter is used frequently under extreme conditions.

Many low-cost filters tend to attract spots or dirt over time, which can be difficult to clean. In contrast, NiSi Air UV filters feature a dirt-repellent surface, making it easy to wipe off fingerprints or water droplets.

The frame also plays an important role: the NiSi Air UV filter has an ultra-thin brass frame that is both sturdy and prevents vignetting, even on ultra-wide lenses. Unlike aluminum frames, which can warp, the brass frame maintains its shape, ensuring a secure fit.

Conclusion: Why NiSi Is the Best Choice

The analysis clearly shows that NiSi UV filters rank at the top when it comes to light transmission and reflection performance.

Summary of advantages:
• Highest light transmission of up to 99.756%
• Extremely low reflection, resulting in less stray light and better contrast
• Premium construction with nano-coating and sturdy brass frame
• Dirt- and water-repellent surface, perfect for outdoor photographers

Our recommendation: If you want to get the most out of your camera, NiSi Air UV filters are an excellent choice. They offer an unbeatable combination of optical quality, durability, and minimal reflection.