FNDU-25C02-30 25 mm Dia. Unmounted UVFS Reflective Neutral Density Filter; t=2mm 200-400nm

OptoSigma's FNDU-25C02-30 is a 25 mm diameter, unmounted Neutral Density Filter, designed for use in the ultraviolet range of 200-400nm. This filter is made from UVFS material, identified as "UVFS mal- 1965" in the item data, and has a thickness of 2mm, providing a balance between durability and compactness.

The filter features a Reflective Neutral Density coating on both the front and back surfaces, denoted as "opt fndu-30". This coating is designed to reduce the intensity of light, without altering its color, making it ideal for applications where a consistent level of light is required.

The filter's geometry is defined by its 25mm diameter, which is suitable for a wide range of optical systems. The shape of the filter is described as a "Thin Lens", indicating that it is designed to minimize optical distortion and maintain the integrity of the light path.

The filter is currently in stock and available for purchase through the OptoSigma website, as indicated by the "weblink status" in the item data. This filter is a part of OptoSigma's extensive catalog of optical elements, which includes a wide range of filters, lenses, and other optical components.