Lunt blocking filter for H-alpha sun observation B600 - 2″ angled return

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

The Lunt B600 blocking filter, integrated into a 2" format angled return, is an essential component for observing the Sun in H-alpha light. Designed to guarantee total safety and exceptional image quality, this filter is specifically optimized to isolate the Hydrogen Alpha spectral line (656.28 nm). Thanks to its 6 mm diameter, it offers an enlarged field of view, ideal for telescopes equipped with 2" eyepiece holders and focal lengths up to 540 mm. This filter is perfect for solar astronomy enthusiasts wishing to combine visual observation with light astrophotography.

What is the purpose of a blocking filter?

A blocking filter is an indispensable part of any H-alpha solar system. Whereas 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 designed for moderate focal length telescopes. It is integrated into a 2" angled eyepiece, offering enhanced compatibility with modern eyepieces and cameras. This system guarantees sharp, high-contrast images and maximum safety.

Key features

• Blocking filter diameter : 6 mm (B600), optimized for focal lengths up to 540 mm.
• Integrated angled return : 2" format, compatible with standard 2" or 1.25" eyepieces (adapter included).
• 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.
• Integrated T2 thread : Allows easy connection to astrophotographic cameras.

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.
• Universal compatibility : Works with all Lunt solar telescopes equipped with a 2" eyepiece holder.
• Practical versatility : Suitable for both visual observation and light astrophotography.

Recommended applications

• Visual observation of the Sun in H-alpha : Explore solar prominences, filaments and chromospheric granulation with optimum 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.