AND-40C-25 40 mm Dia. Optical Glass Unmounted Visible Absorptive Neutral Density Filter 400-700nm

OptoSigma's AND-40C-25 is a high-quality Neutral Density Filter, designed for use in the visible light spectrum, specifically between 400-700nm. This unmounted filter, with a diameter of 40mm and a thickness of 2mm, is a circular filter made of optical glass, featuring an Absorptive Neutral Density coating on both the front and back surfaces.

The filter's primary function is to reduce the intensity of light entering an optical system, allowing for the control of exposure or depth of field without affecting color balance. The Absorptive Neutral Density coating is a uniform darkening of the glass, which reduces the amount of light transmitted without causing any color shift.

The filter's geometry, with a diameter of 40mm, is designed to fit into most standard optical systems. The thin lens shape ensures minimal distortion and maintains the integrity of the optical path. The filter is made from UVFS Mal-1965, a high-quality optical material known for its clarity and durability.

The catalog number AND-40C-25 is a unique identifier for this specific filter, making it easy to reference and order. The filter is currently in stock and available for purchase through the vendor's website.