The ND501A is a Neutral Density Filter from Thorlabs, designed with a circular base shape and a diameter of 0.5 inches. This filter is made from n-bk7 schott material and has a thickness of 1 millimeter. It is designed to work optimally with a wavelength of 633 nanometers.
The ND501A features a thin lens shape and is equipped with a front and back coating of tho nd01. This coating is part of Thorlabs' Neutral Density filter series, known for its high-quality and reliable performance. The filter is mounted with an SM05 thread, ensuring a secure and stable fit.
According to the vendor's information, the ND501A is currently in stock and can be purchased directly from Thorlabs' website. The item's catalog number is ND501A, and the web link provided leads to the product's page on Thorlabs' website for easy access and purchase.