ND213B 50 mm x 50 mm; Unmounted Reflective ND Filter; Optical Density 1.3
- Type
- Filter
- Subtype
- Neutral Density Filter
- Brand
- Thorlabs
Properties
- Shape
- Rectangular
Material
- Name
- N-BK7
- Dispersion Equation
- Sellmeier
- n (λ)
- 1.5150823520020043
- λ
- 633 nm
- B1
- 1.03961212
- C1
- 0.00600069867 μm2
- B2
- 0.231792344
- C2
- 0.0200179144 μm2
- B3
- 1.01046945
- C3
- 103.560653 μm2
ND213B 50 mm x 50 mm; Unmounted Reflective ND Filter; Optical Density 1.3
The ND213B is a 50 mm x 50 mm unmounted reflective neutral density filter, offering a versatile solution for various optical applications. Manufactured by Thorlabs, this filter boasts an optical density of 1.3, providing a reduction in light transmission of approximately 20%.
This filter is designed with a rectangular base shape, constructed from N-BK7 Schott glass, a material renowned for its excellent optical properties. The ND213B features a thickness of 2 mm, contributing to its robustness and durability.
The ND213B is coated with Thorlabs' proprietary THo ND13 coating on both the front and back surfaces. This coating enhances the filter's performance by reducing surface reflections and improving transmission.
The filter's thin lens shape allows for easy integration into various optical systems. The ND213B is currently in stock and available for immediate purchase through the Thorlabs website.
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