MFND-25-20 25 mm Dia. Mounted 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
MFND-25-20 25 mm Dia. Mounted N-BK7 Visible Reflective Neutral Density Filter; t=2mm 400-700nm
OptoSigma's MFND-25-20 is a Neutral Density Filter, designed with a circular geometry and a diameter of 25 mm. This filter is mounted and has a thickness of 2 mm, making it a Thin Lens type. The base shape is circular, and it is made of N-BK7 Schott, a high-quality optical glass known for its excellent transparency and low auto-fluorescence.
The filter is coated on both the front and back with Opt FND-20, a reflective neutral density coating that is specifically designed for the visible spectrum, ranging from 400 to 700 nm. This coating provides a uniform attenuation of the incident light, regardless of its wavelength within the specified range.
The MFND-25-20 is currently in stock and available for purchase. For more information, you can refer to the product's webpage at https://www.optosigma.com/us_en/optics/filters/neutral-density-filters/reflective-neutral-density-filter-mounted-visible-25mm-diameter-20i1-4-MFND-25-20.html.