FND-20C02-40 20 mm Dia. Unmounted N-BK7 Visible Reflective Neutral Density Filter; t=2mm 400-700nm

OptoSigma's FND-20C02-40 is a high-quality Neutral Density Filter, designed for use in the visible light spectrum, specifically between 400-700nm. This unmounted filter, with a 20mm diameter and a thickness of 2mm, is made from N-BK7 Schott, a well-regarded optical glass known for its excellent transmittance and low auto-fluorescence.

The filter features a reflective neutral density coating on both the front and back surfaces, denoted as 'opt fnd-40'. This coating is designed to reduce the intensity of light passing through the filter without altering its color balance, making it an ideal choice for applications requiring light control, such as photography, laser applications, and scientific research.

The filter's thin lens shape and unmounted design provide flexibility for integration into various optical systems. The current web link status indicates that this item is in stock, making it readily available for immediate use. For more detailed information or to make a purchase, users can visit the provided weblink.