66-239 25 mm Dia. Hard Coated High Performance OD 4.0 Longpass Filter; t=3 mm 1000nm

The 66-239 is a high-performance longpass filter, boasting a 25 mm diameter and a thickness of 3 mm, sourced from the renowned optical vendor, Edmund Optics. This filter is designed to transmit light with wavelengths greater than or equal to 1000 nm, while effectively blocking shorter wavelengths.

The filter is constructed with a base shape of a circular Thin Lens, ensuring efficient light transmission and minimal distortion. It is made from UVFS Mal-1965 material, a high-quality optical material known for its durability and excellent optical properties.

The 66-239 filter features hard coating on both the front and back surfaces, denoted as 'edm 66-231'. This coating enhances the filter's durability and resistance to scratches and other forms of damage, making it suitable for rigorous use in various applications.

The filter's physical data includes a cut-on wavelength of 1000 nm, indicating the wavelength at which the filter starts to transmit light. The cut-off wavelength is 0 nm, meaning it blocks all wavelengths below this value.

This filter is currently in stock and available for immediate purchase through the provided weblink. With its robust construction, high-performance longpass characteristics, and availability from a trusted vendor, the 66-239 filter is an excellent choice for various optical applications.