ND2R40B Dia. 50 mm Unmounted Reflective ND Filter; Optical Density 4.0

The ND2R40B is a circular Neutral Density Filter with a diameter of 50 mm and a thickness of 2 mm, sourced from the renowned optical component manufacturer, Thorlabs. This filter is designed to reduce the intensity of incident light without altering its color composition, making it an essential tool for various optical applications.

The filter's primary feature is its high optical density of 4.0, which signifies a significant reduction in light intensity. This makes it particularly useful in high-intensity lighting scenarios, such as laser applications or bright sunlight conditions, where controlling light intensity is crucial.

The ND2R40B filter boasts a coating of 'tho nd40' on both the front and back surfaces. This coating enhances the filter's performance by reducing surface reflections and improving transmission, thereby maximizing the filter's effectiveness in controlling light intensity.

The filter's geometry is shaped as a thin lens, which not only contributes to its compact design but also minimizes optical aberrations. This makes the ND2R40B an excellent choice for applications that require high precision and accuracy.

In terms of compatibility, the ND2R40B is an unmounted filter, offering users the flexibility to integrate it into their existing optical systems. It is made of N-BK7 Schott, a high-quality optical glass known for its excellent transparency and low auto-fluorescence, ensuring reliable and consistent performance.

To sum up, the ND2R40B Dia. 50 mm Unmounted Reflective ND Filter; Optical Density 4.0 is a high-performance, versatile, and reliable optical component, ideal for a wide range of applications that require precise control over light intensity.