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
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.