65-815 50 mm Dia. Hoya ND-25 Absorptive Neutral Density (OD 0.7) Color Filter; t=3.1 mm 400-700nm
- Type
- Filter
- Subtype
- Color Glass
- Brand
- Edmund Optics
Properties
- Shape
- Circular
- Diameter
- 50 mm
Material
- Name
- UVFS
- Dispersion Equation
- Sellmeier
- n (λ)
- 1.458448271212196
- λ
- 588 nm
- B1
- 0.6961663
- C1
- 0.004679148 μm2
- B2
- 0.4079426
- C2
- 0.013512063 μm2
- B3
- 0.8974794
- C3
- 97.93400254 μm2
65-815 50 mm Dia. Hoya ND-25 Absorptive Neutral Density (OD 0.7) Color Filter
The 65-815 is a 50 mm diameter Circular Color Glass Filter manufactured by Hoya, a renowned name in the optical industry. This filter is part of the Absorptive Neutral Density family, specifically designed with an ND-25 (Optical Density 0.7) rating. The filter's primary function is to reduce the intensity of all wavelengths of light equally, which is particularly useful in photography and optics when a reduction in light is required without altering the color balance.
The filter's geometry includes a diameter of 50 mm and a thickness of 3.1 mm, making it suitable for various applications. The front and back surfaces of the filter are coated with EDm 63-458, a coating type known for its durability and performance. This coating enhances the filter's overall functionality by reducing reflection and increasing transmission, thereby improving the quality of the light passing through.
The 65-815 filter is designed in a Thin Lens shape, which is beneficial in maintaining the optical path length and reducing unwanted aberrations. This filter is available from Edmund Optics and can be found on their official website, where it is listed as in stock.