ND2R40A Dia. 50 mm Reflective ND Filter; SM2-Threaded Mount; Optical Density 4.0
- Type
- Filter
- Subtype
- Neutral Density Filter
- Brand
- Thorlabs
Properties
- Shape
- Circular
- Diameter
- 50 mm
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
ND2R40A Dia. 50 mm Reflective ND Filter; SM2-Threaded Mount; Optical Density 4.0
The ND2R40A is a Neutral Density Filter with a diameter of 50 mm and a thickness of 2 mm, manufactured by Thorlabs. This filter is designed to reduce the intensity of incident light without altering its color composition, making it an ideal tool for various applications in photography, cinematography, and optical research.
The filter features a front and back coating of tho nd40, which provides a high level of neutrality and ensures consistent light reduction across the visible spectrum. This coating also enhances the filter's durability and resistance to scratches and other forms of damage.
The ND2R40A is designed with a Thin Lens shape and is mounted with an SM2-Threaded Mount, ensuring a secure and stable fit. The catalog number for this item is ND2R40A, and it is currently in stock on Thorlabs' website.
This filter is made from n-bk7 schott, a high-quality optical glass known for its excellent transmittance, homogeneity, and resistance to thermal shock. The filter's circular shape and 50 mm diameter make it compatible with a wide range of optical systems and equipment.
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