Chroma Sloan z' photometric filter - 2″ Mounted

Chroma Sloan z’ Photometric Filter’

Visit Chroma Sloan z’ photometric filter’ is designed to capture the near-infrared spectral band (approx. 850-950 nm) for photometric studies using the Sloan Digital Sky Survey (SDSS) system. This filter is ideal for astrophotographers and researchers wishing to accurately measure the brightness and physical properties of stars, galaxies and other celestial objects. Thanks to its advanced design and high-quality coatings, it guarantees optimum performance, even with modern CCD and CMOS sensors.

Key features

• Spectral transmission:
  • Focused on the near-infrared band (z’), with high transmission around 893.2 nm.
  • Effective blocking of distant UV and IR wavelengths to prevent light interference.
• Sustainable construction:
  • Multi-layer anti-reflective coatings (Reflex-Blocker™) to minimize halos and stray reflections.
  • Blackened edges to eliminate internal reflections.
  • Standard 2 mm thickness, compatible with most filter wheels and optical systems.
• Compatibility:
  • Parfocal with other Sloan filters (u’, g’, r’, i’), eliminating the need for refocusing.
  • Works perfectly with modern CCD and CMOS cameras, even on high-speed telescopes (f/1.8 to f/15).

Sloan filter technology and application

Photometric system filters Sloan Digital Sky Survey (SDSS) filters have been developed to provide uniform, accurate spectral coverage in five distinct bands (u', g', r', i', z'). Unlike traditional UBVRI filters, Sloan filters use advanced dielectric coatings offering stable transmission, clean cut-off of out-of-band wavelengths and excellent durability.

The Sloan z’ filter is particularly useful for studying cool stars, such as red dwarfs or red giants, and for analyzing galaxies where the redshift shifts their light into this spectral band. It enables precise measurement of magnitude in this near-infrared band and calculation of color indices. These data are essential for characterizing the physical properties of celestial objects, such as their temperature, chemical composition or distance.

Applications

• Scientific photometry (Sloan SDSS):
  • Precise measurement of brightness in the near-infrared band.
  • Study of cold stars, stellar variables, supernovae, star clusters and galaxies.
• Advanced astrophotography:
  • Perfect complement to the other Sloan filters (u’, g’, r’, i’) to produce scientifically calibrated data sets.
• Astronomical research:
  • Detailed spectral analysis and physical characterization of celestial objects in the near-infrared band.

Conclusion

Visit Chroma Sloan z’ photometric filter’ is an indispensable tool for amateur or professional astronomers wishing to carry out precise photometric studies in the near-infrared band of the spectrum. Its robust design, optimized optical performance and compatibility with modern sensors make it an essential choice for scientific imaging and advanced astronomical observation.