Lunt blocking filter for H-alpha sun observation B1200 - 1.25″ angled return.

Lunt B1200 blocking filter: Solar observation in H-alpha light

The Lunt B1200 blocking filter, integrated into a 1.25" angled return, is an indispensable component for solar observation in H-alpha light. Designed to guarantee absolute safety and exceptional image quality, this filter is optimized to isolate the Hydrogen Alpha spectral line (656.28 nm). Thanks to its 12 mm diameter, it offers an enlarged field of view, ideal for telescopes with focal lengths up to 1080 mm. This model is perfect for demanding solar astronomers wishing to explore the Sun's chromosphere in striking detail.

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 B1200 model, with its 12 mm diameter, is designed to offer :

• A comfortable view of the complete solar disk.
• Compatibility with medium-sized sensors for astrophotography.
• A sharp, high-contrast image thanks to its multi-layer system.

Key features

• Blocking filter diameter : 12 mm (B1200), optimized for focal lengths up to 1080 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 medium-sized sensors.

Why choose the Lunt B1200 blocking filter?

• Advanced visual observation : The B1200 offers an enlarged field of view, perfect for comfortably observing the complete solar disk with moderate focal length telescopes.
• 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 astrophotography with modern cameras.
• Universal compatibility : Works with all Lunt solar telescopes equipped with a 1.25" eyepiece holder.

Recommended applications

• Visual observation of the Sun in H-alpha : Explore solar prominences, filaments and chromospheric granulation with optimum contrast.
• Advanced solar astrophotography : Compatible with cameras equipped with medium-sized sensors.
• Ideal for focal lengths up to 1080 mm, on compact or intermediate instruments.