Lunt blocking filter for H-alpha sun observation B600 - 2″ straight tube

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

The Lunt B600 blocking filter, integrated into a 2" format straight tube, 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 a field of view suitable for telescopes equipped with 2" eyepiece holders and focal lengths up to 540 mm. This straight-tube model is particularly appreciated for use in solar imaging or with configurations requiring a shorter optical path.

What is the purpose of a blocking filter?

A blocking filter is indispensable in 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. Its straight-tube design allows optimum compatibility with astrophotographic cameras and accessories requiring a reduced optical path, while offering exceptional image quality.

Key features

• Blocking filter diameter : 6 mm (B600), optimized for focal lengths up to 540 mm.
• Straight tube : 2" format, ideal for configurations requiring a short optical path.
• Multiple connections :
  • 2" inlet for eyepiece holder.
  • 1.25" 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 B600 blocking filter in straight tube?

• Optimized visual observation and imaging : The B600 offers a field of view suitable for observing the complete solar disk, and is also suitable for small to medium-sized sensors.
• Compact, versatile design: The straight tube format is ideal for configurations where the optical path must be reduced, as in astrophotography.
• 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 and equipment.
• 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 540 mm, on compact or intermediate instruments.