FND-20C02-0.1 20 mm Dia. Unmounted N-BK7 Visible Reflective Neutral Density Filter; t=2mm 400-700nm

The FND-20C02-0.1 is a high-quality Neutral Density Filter, unmounted and with a 20 mm diameter. This filter is sourced from OptoSigma, a renowned vendor known for their extensive catalog of optical elements. The filter is designed for use in the visible light spectrum, specifically between 400 and 700 nanometers.

The filter is made from N-BK7, a type of borosilicate glass manufactured by Schott AG, a leading glass manufacturer. This material is known for its excellent optical properties, making it a popular choice for various optical applications. The filter has a thickness of 2mm, providing durability and resistance to external pressures.

The filter features a Reflective Neutral Density coating on both the front and back surfaces. This coating is identified as 'opt fnd-0-1', and it provides a neutral density of 0.1, or 10%, across the entire visible spectrum. This means that the filter reduces the intensity of the incident light by a factor of 10, without altering the color balance.

The filter's shape is defined as a Thin Lens, which is a lens with a thickness that is much smaller than its diameter. This shape ensures minimal optical aberrations, providing clear and accurate optical transmission.

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