ND205B 50 mm x 50 mm; Unmounted Reflective ND Filter; Optical Density 0.5

The ND205B is a 50 mm x 50 mm Neutral Density (ND) filter, part of Thorlabs' extensive catalog of optical elements. This unmounted reflective ND filter boasts an Optical Density of 0.5, making it an ideal choice for various applications that require light reduction while maintaining color neutrality.

The filter is made of N-BK7 Schott, a high-quality optical glass known for its excellent transmittance and low auto-fluorescence. The ND205B's geometry measures 50 mm in width and height, with a thickness of 2 mm, ensuring durability and precision.

Both the front and back surfaces of the filter are coated with Thorlabs' proprietary tho nd05 coating, designed to provide consistent neutral density while minimizing reflection and scatter. This coating enhances the filter's performance in applications that demand high-quality imaging and accurate light measurement.

The ND205B's thin lens shape allows for easy integration into various optical systems, while its unmounted design provides flexibility in choosing the optimal mounting solution. With a validated web link to Thorlabs' product page, users can rest assured that this item is in stock and readily available for their optical needs.