NE20A-A Dia. 25 mm AR-Coated Absorptive Neutral Density Filter; SM1-Threaded Mount; 350-700nm; OD 2.0 AR 350-700nm

The NE20A-A is a Neutral Density Filter, specifically designed for use in optical systems where light intensity needs to be reduced without altering the color composition. This filter, sourced from Thorlabs, boasts a 25 mm diameter and a thickness of 1.4 mm, making it a compact yet effective solution for various applications.

The NE20A-A filter features an Absorptive Neutral Density design, which means it reduces light intensity by absorbing a portion of the light that passes through it. This design ensures consistent performance and maintains the color balance of the light. The filter has an Optical Density (OD) of 2.0, which translates to a 100:1 reduction in light intensity.

The filter's coating is another notable feature. Both the front and back surfaces are AR-coated for the 350-700nm wavelength range. This Anti-Reflective coating reduces surface reflections, thereby improving transmission and minimizing unwanted artifacts such as ghosting and flaring.

The NE20A-A filter is mounted in an SM1-threaded mount, providing a secure and stable connection to your optical system. This mount is compatible with other SM1-threaded components, offering flexibility in system design.