NE504A Dia. 0.5 in Absorptive ND Filter; SM05-Threaded Mount; Optical Density 0.4

The NE504A is a Neutral Density (ND) Filter, designed and manufactured by Thorlabs, a leading vendor in the optical industry. This filter is characterized by its circular shape, with a diameter of 12.7 mm and a thickness of 0.7 mm, making it suitable for a wide range of optical applications.

The NE504A filter features an absorptive coating, denoted as 'tho ne04a' on both the front and back surfaces. This coating provides an optical density of 0.4, which is equivalent to a transmission of approximately 39.8%. This characteristic makes the filter particularly useful in controlling light intensity without altering the color composition of the incident light.

The filter is mounted in an SM05 thread, a common thread size in the optical industry. This mounting system ensures compatibility with various optical components and systems that use the SM05 thread.

For more detailed information, including availability and pricing, please refer to the vendor's website using the provided weblink. The link has been verified and is currently valid, indicating that the filter is in stock.