U-Bessell Chroma photometric filter - 2″ Mounted

U-Bessell Chroma Photometric Filter

Visit U-Bessell Chroma photometric filter is a precision tool designed for astrophotography and scientific photometry. Optimized to capture ultraviolet light in a specific range (320-400 nm), this filter is ideal for photometric studies of stars, galaxies and other celestial objects. With its robust construction and advanced coatings, it guarantees reliable long-term performance, even under demanding observing conditions.

Key features

• Spectral transmission Focus on the ultraviolet (U) band, with a carefully defined transmission window between 320 and 400 nm.
• Compatibility :
  • Parfocal with other Chroma photometric filters (B, V, R, I), eliminating the need for refocusing.
• Sustainable construction :
  • Multi-layer anti-reflective coatings to minimize halos and stray reflections.
  • Blackened edges to prevent internal reflections.
  • Standard 2 mm thickness for compatibility with most filter wheels.

Bessell filter technology and application

Bessell filters, developed in the 1990s, have become a standard in scientific astrophotography thanks to their ability to deliver data comparable to the old Johnson/Cousins systems. These filters are specially designed for modern CCD/CMOS sensors, enabling precise measurement of the brightness and color of celestial objects. Unlike older tinted glass filters, modern Bessell filters use advanced dielectric coatings, guaranteeing stable transmission and increased resistance to aging.

The U-Bessell filter is particularly well suited to photometric studies, as it captures ultraviolet light that is often absorbed by the Earth's atmosphere. It is essential for analyzing young or hot stars, as well as for studying active regions in galaxies. Its design makes it possible to obtain results consistent with historical databases, while fully exploiting the performance of modern sensors.

Applications

• Scientific photometry (UBVRI) to measure the brightness and color of stars.
• Astrophysical studies requiring spectral precision in the ultraviolet.
• Advanced astrophotography with monochrome CCD or CMOS cameras.

Conclusion

Visit U-Bessell Chroma filter combines scientific tradition and technological innovation. It is an essential choice for amateur or professional astronomers wishing to carry out precise photometric studies or capture detailed ultraviolet images.