AND-40S-25 40 x 40 mm Optical Glass Unmounted Visible Absorptive Neutral Density Filter 400-700nm

The AND-40S-25 is a high-quality Neutral Density Filter, offered by the renowned optical components manufacturer, OptoSigma. This filter is designed for use in the visible light spectrum, specifically covering the wavelength range of 400-700nm.

The filter is rectangular in shape, with dimensions of 40 x 40 mm, making it suitable for a wide range of optical applications. It boasts a thickness of 2mm, ensuring durability and stability during operation. The filter is unmounted, providing users with the flexibility to integrate it into their existing optical systems or mounts.

The AND-40S-25 features a special Absorptive Neutral Density coating on both the front and back surfaces, identified as 'opt and-25'. This coating is designed to uniformly reduce the intensity of light passing through the filter, without altering the color balance. This makes it an ideal choice for applications requiring light control, such as photography, beam attenuation, or laser applications.

The filter is made from UVFS Mal-1965 optical glass, a material known for its excellent optical properties and durability. This, coupled with the precise coating, ensures high transmittance and minimal optical distortion.