Lunt blocking filter for H-alpha sun observation B1200 - 2″ straight tube

Lunt B1200 2″ Straight Tube Blocking Filter - Specifications and Features

Visit Lunt B1200 blocking filter, integrated into a 2″ format straight tube, is an essential component for solar observation in H-alpha light. Designed to guarantee total safety and outstanding image quality, this filter is specifically optimized to isolate the Hydrogen Alpha spectral line (656.28 nm). With a diameter of 12 mm, it offers an enlarged field of view, ideal for telescopes with focal lengths of up to 1080 mm. This model is perfect for demanding solar astronomers who want to explore the Sun's chromosphere in fascinating detail.

What is the purpose of a blocking filter?

A blocking filter is an indispensable 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», eliminating stray wavelengths and unwanted harmonics. This ensures that only light centered on 656.28 nm reaches the eyepiece or camera, delivering a sharp, high-contrast image.

The B1200 model is designed for :

• Offer comfortable observation of the complete solar disk.
• Be compatible with medium-sized sensors for detailed images.
• Maximize optical quality with its multi-layer system.

Key features

• Blocking filter diameter : 12 mm (B1200), optimized for focal lengths up to 1080 mm.
• Straight tube : 2″ format, ideal for configurations requiring a shorter optical path.
• Multiple connections : 2″ threaded inlet for eyepiece holder and 1.25″ threaded outlet with integrated T2 thread for camera or eyepiece.
• 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.

Why choose the Lunt B1200 blocking filter in straight tube?

1. Advanced visual observation : The B1200 offers an enlarged field of view and optimum contrast for comfortable viewing of the complete solar disk.
2. Advanced astrophotography : Thanks to its generous 12 mm diameter and integrated T2 thread, it is ideal for capturing detailed images with modern cameras.
3. Outstanding image quality : Thanks to its multi-layer system, it guarantees sharp, high-contrast images without light interference.
4. Total safety : Effectively blocks harmful UV and IR radiation, ensuring safe use for your eyes and equipment.
5. Universal compatibility : Works with all Lunt solar telescopes equipped with a 2″ 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 modern cameras thanks to integrated T2 thread.
• Ideal for focal lengths up to 1080 mm, on intermediate or advanced instruments.