The NDUV04A is a Neutral Density Filter from Thorlabs, designed with a circular shape and a diameter of 25 mm. This filter is part of the UVFS series, characterized by its UV reflective coating, and is identified by the material ID [uvfs mal- 1965].
The NDUV04A features a front and back coating of tho nduv od04, providing a neutral density effect. It is designed with a thin lens shape and has a thickness of 1 mm. This filter is compatible with SM1-threaded mounts, offering versatility in its application.
According to the vendor's information, the NDUV04A is currently in stock, and you can find more details or make a purchase through the provided weblink: https://www.thorlabs.com/thorproduct.cfm?partnumber=NDUV04A.