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FND-25C02-20 25 mm Dia. Unmounted N-BK7 Visible Reflective Neutral Density Filter; t=2mm 400-700nm

FND-25C02-20 25 mm Dia. Unmounted N-BK7 Visible Reflective Neutral Density Filter; t=2mm 400-700nm

Type
Filter
Subtype
Neutral Density Filter
Brand
OptoSigma
Product webpage
OptoSigma products in the 3DOptix catalog

Properties

Shape
Circular
Diameter
25 mm

Material

Name
N-BK7
Dispersion Equation
Sellmeier
n (λ)
1.5185223876207927
λ
550 nm
B1
1.03961212
C1
0.00600069867 μm2
B2
0.231792344
C2
0.0200179144 μm2
B3
1.01046945
C3
103.560653 μm2

FND-25C02-20 25 mm Dia. Unmounted N-BK7 Visible Reflective Neutral Density Filter; t=2mm 400-700nm

This is the FND-25C02-20, a 25 mm diameter, unmounted Neutral Density Filter from OptoSigma. It is designed for use in the visible light spectrum, specifically between 400 and 700 nanometers. The filter is made from N-BK7 Schott, a high-quality borosilicate glass known for its excellent optical properties.

The filter features a reflective coating on both the front and back surfaces, identified as 'opt fnd-20'. This coating is designed to provide a neutral density effect, reducing the intensity of light without altering its color balance. The thickness of the filter is 2 millimeters, contributing to its overall durability and stability.

The FND-25C02-20 is shaped as a thin lens, making it suitable for a wide range of optical applications. It is currently in stock and available for purchase through the OptoSigma website, as indicated by its 'Valid - in stock' web link status.

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