FND-25C02-80 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-25C02-80 25 mm Dia. Unmounted N-BK7 Visible Reflective Neutral Density Filter; t=2mm 400-700nm
This is the FND-25C02-80, a 25 mm diameter, unmounted Neutral Density Filter from OptoSigma. It is designed for use in the visible light spectrum, specifically between 400-700nm. The filter features a front and back coating of 'opt fnd-80', which provides a high level of neutral density, reducing the intensity of light without altering its color composition.
The filter is made from N-BK7, a high-quality borosilicate glass manufactured by Schott. This material is known for its excellent optical properties, making it a popular choice for a wide range of optical applications. The filter has a thickness of 2mm, which is considered 'thin' in lens terminology, reducing the likelihood of vignetting and other optical aberrations.
The FND-25C02-80 is available directly from the OptoSigma website and is currently in stock. The product information, including the catalog number and weblink, is provided for easy reference and ordering.
