Lunt blocking filter for H-alpha sun observation B600 - 1.25″ angled return

Lunt B600 blocking filter: Solar observation in H-alpha light

The Lunt B600 blocking filter, integrated into a 1.25” angled return, is an indispensable component for H-alpha sunlight observation. Designed to guarantee total safety and exceptional image quality, this filter is optimized to isolate the Hydrogen Alpha spectral line (656.28 nm). It reveals the fascinating details of the solar chromosphere, such as protuberances, filaments and chromospheric granulation. Thanks to its 6 mm diameter, it offers an enlarged field of view, ideal for visual observation and solar imaging with moderate focal length telescopes.

What is the purpose of a blocking filter?

A blocking filter is an essential part of any H-alpha solar system. While the Fabry-Perot standard isolates a narrow band around the H-alpha line, the blocking filter acts as a "spectral cleaner". It eliminates stray wavelengths and unwanted harmonics, ensuring that only light centered on 656.28 nm reaches the eyepiece or camera.

The B600 model, with its 6 mm diameter, is specifically designed for telescopes with focal lengths up to 540 mm. It offers an excellent compromise between visual observation and light astrophotography.

Key features

• Blocking filter diameter : 6 mm (B600), optimized for focal lengths up to 540 mm.
• Integrated angled return : 1.25" format, compatible with a wide range of standard eyepieces.
• Maximum safety : Complies with international standards for safe solar observation.
• Spectral optimization : Eliminates unwanted harmonics to isolate exclusively the H-alpha line (656.28 nm).
• Robust construction: Machined aluminum case with high-precision optical components.
• Increased versatility : Ideal for combining visual observation and imaging with small to medium-sized sensors.

Why choose the Lunt B600 blocking filter?

• Optimized visual observation : The B600 offers an enlarged field of view, perfect for comfortably observing the entire solar disk.
• Outstanding image quality : Thanks to its multi-layer system, it guarantees sharp, high-contrast images without light interference.
• Absolute safety : Effectively blocks harmful UV and IR radiation, ensuring safe use for your eyes.
• Practical versatility : Suitable for both visual observation and light astrophotography.
• Universal compatibility : Works with all Lunt solar telescopes equipped with a 1.25" angled return.

Recommended applications

• Visual observation of the Sun in H-alpha : Explore solar protuberances, filaments and granulation with optimal contrast.
• Light astrophotography : Compatible with cameras equipped with small to medium-sized sensors.
• Ideal for focal lengths up to 540 mm on compact or intermediate instruments.