• Chroma Technology Classic UBVRI Photometric Johnson/Cousins Bessell filters are designed for photometry purposes.
• Unlike narrowband, Bessell filter are wide band filters that permit and reject very wide bandpasses.
• The UBVRI filter set encompasses Ultraviolet, Blue, Visible, Red, and Infrared bands.
• These filters are used for analyzing star distance, temperature, composition, and analysis of galaxy or nebulae composition, among other purposes.
• The Ultraviolet filter, also known as the "U Passband," permits a bandpass range of approximately 300-400 nm with a bandpass width of around 100 nm.
• This filter is the 1.25" Mounted configuration of the Chroma Classic U Bessell filter.

The Chroma Technology Classic UBVRI Photometric Johnson/Cousins Bessell filters are designed specifically for photometry purposes. They can be thought of as somewhat the reverse of narrowband filters which only allow a very specific bandpass. In the case of these filters, they are wide band filters that permit and reject very wide bandpasses. The UBVRI, or often known as Bessell or Johnson/Cousins is a popular photometric filter set that encompasses Ultraviolet, Blue, Visible, Red and Infrared bands. These filters can be used for a variety of purposes such as analyzing star distance, temperature, composition and analysis of galaxy or nebulae composition and much more.

The first filter in the UBVRI set is the Ultraviolet filter, which permits a bandpass range from approximately 300 - 400 nm with a bandpass width of around 100 nm. This is often referred to as the "U Passband".