Chroma V-Bessell photometric filter - 2″ Mounted

Chroma V-Bessell photometric filter

Visit Chroma V-Bessell photometric filter is a high-precision filter designed for astronomical photometry. Optimized to capture the green spectral band (approx. 500-600 nm), it is ideal for scientific studies of stars, galaxies and variable objects. This filter complies with Johnson-Cousins/Bessell photometric standards, guaranteeing reliable measurements that are comparable with historical databases.

Key features

• Spectral transmission:
  • Focused on the green (V) band, with high transmission and effective UV and IR wavelength cut-off.
• Compatibility:
  • Parfocal with other Chroma photometric filters (U, B, 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, compatible with most filter wheels.

Use and technology behind Bessell filters

Bessell filters have been designed to reproduce the characteristics of the original Johnson-Cousins filters, while adapting to modern CCD/CMOS sensors. They are widely used in astrophotometry, thanks to their ability to provide accurate, standardized measurements of the brightness and color of celestial objects.

Unlike the tinted glass filters used historically, modern Bessell filters use advanced dielectric coatings that offer stable transmission and better resistance to aging. The V-Bessell filter is particularly suitable for studying the visible luminosity of stars and determining color indices such as g'-r'. It is essential for photometric observations of stellar variables, exoplanets and star clusters.

Applications

• Scientific photometry (UBVRI):
  • Precise measurement of brightness in the green band.
  • Studies of stellar variables, exoplanets and transient events.
• Advanced astrophotography:
  • The perfect complement to other UBVRI filters for creating scientifically calibrated data sets.
• Scientific research:
  • Spectral analysis and study of the physical properties of stars and galaxies.

Conclusion

Visit Chroma V-Bessell filter combines scientific tradition and technological innovation. It is an indispensable tool for amateur or professional astronomers wishing to carry out precise photometric studies in the green band of the visible spectrum. Its robust design and optical performance make it an essential choice for scientific imaging.