This is the 497-16 EX, a 25 mm diameter mounted excitation fluorescence bandpass filter, with a thickness of 3mm, manufactured by Iridian Spectral Technologies. The filter is designed to transmit light within the specific wavelength range of 489-505nm, making it ideal for applications that require narrow-band light transmission.
The filter is made of a high-quality material, UVFS MAL-1965, and features a thin lens shape. The front and back of the filter are coated with IRI 497-16-EX, a coating specifically designed to enhance the filter's performance. The cut-on wavelength is 489nm, and the cut-off wavelength is 505nm, with a central wavelength of 497nm.
The filter is currently in stock and available for purchase. For more information, you can visit the vendor's website through the provided weblink: https://www.iridian.ca/product/497-16-ex/.