ND501B Dia. 0.5 in Unmounted Reflective ND Filter; Optical Density 0.1

The ND501B is a circular, unmounted Neutral Density (ND) filter, manufactured by Thorlabs, with a diameter of 0.5 inches and a thickness of 1 millimeter. This filter is designed to reduce the intensity of incident light without altering its color composition, making it an ideal tool for various optical applications.

The filter's primary material is N-BK7 Schott, a high-grade borosilicate glass known for its excellent optical properties, including low auto-fluorescence, high homogeneity, and excellent transmission in the visible spectrum. The ND501B filter features a front and back coating of tho nd01, a reflective coating that provides an optical density of 0.1. This coating ensures high transmission and low reflection, further enhancing the filter's performance.

The filter's geometry is defined by its thin lens shape, which minimizes optical aberrations and ensures high-quality imaging. The ND501B is sourced from Thorlabs, a reputable vendor known for its high-quality optical components. The filter is currently in stock and available for immediate purchase through the provided weblink.