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Lunt LS100FHa 100mm Solar Filter

Special Order
Original price $6,561.00 - Original price $6,561.00
Original price
$6,561.00 - $6,561.00
Current price $6,561.00

Lead-time: 2-4 Months

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Lunt 100mm Solar Filter - LS100FHa

Presenting the Lunt LS100FHa 100mm Solar Filter—a dedicated add-on designed for augmenting solar observation experiences.

This solar filter features a 100mm aperture and features a Root 3 non-centralized obstruction with an integrally tuned etalon. 

Designed to complement a refractor provided by the user, it brings accuracy to solar viewing.

Featured in the standard system is the B600 blocking filter, delivering thorough full disk images when paired with telescopes possessing focal lengths of up to 540mm. 

Additionally, for telescopes with longer focal lengths, larger blocking filters tailored to these requirements are available as optional add-ons, ensuring versatility in observation setups.

These Hydrogen-alpha filters offer the adaptability to upgrade customer-supplied telescopes for daytime solar observation (adapters may be necessary).

Notably, they are easily detachable, allowing the telescope to seamlessly transition back to night sky observations.

The LS100FHa Solar Filter systems comprise a front-mounted filter and a rear-mounted 2″ or 1.25″ blocking diagonal.

The choice of the blocking filter depends on your telescope and focuser size, ensuring compatibility and optimal performance.

Select the proper blocking filter to perfectly match your telescope setup and maximize your observing capabilities:

  • B600 - Up to 540 mm focal length, offered in 1.25″ or 2″ diagonal  
  • B1200 - Up to 1080 mm focal length, offered in 1.25″ or 2″ diagonal
  • B1800 - Up to 1620 mm focal length, offered in 1.25″ or 2″ diagonal 
  • B3400 - Up to 3060 mm focal length, offered in 2″ straight-through tube

The LS100FHa Solar Filter, with an estimated bandpass of <0.70 Angstroms, can deliver high-contrast views of both surface and edge details.

Incorporating an extra etalon system (double-stacking) will decrease the bandpass to ~<0.50 (depending on the scope), enabling higher-resolution viewing and/or imaging.

The LS100FHa part number serves this purpose, as well as for individuals with an existing Lunt blocking filter.

It is imperative to use a Lunt blocking filter with Lunt Ha filters at all times.

Necessary Additions: To affix a Lunt Solar Filter onto the front of your personal telescope, an adapter plate is often necessary.

While adapter plates for the most commonly used scopes are conveniently obtainable, custom adaptations can be crafted to suit your specific needs.

When integrating an LS100/DS module with an LS100FHa, an adapter becomes indispensable for seamless compatibility.


  • 100mm Optical Aperture: The Lunt LS100FHa 100mm Solar Filter features a substantial 100mm optical aperture, providing a sizable opening for solar observation without a central obstruction, ensuring unimpeded and clear views of solar details.

  • Bandpass: With an estimated bandpass of <0.70 Angstroms, the filter ensures high contrast views by allowing only a narrow range of wavelengths associated with hydrogen-alpha (Ha) solar features.
  • Double-Stacking Capability: The LS100FHa is designed to accommodate an additional etalon system for double-stacking. This feature reduces the bandpass to approximately <0.50 Angstroms (dependent upon the telescope's specifications), thereby facilitating higher resolution for both visual observation and imaging.
  • Versatility: The part number LS100FHa is specifically offered for users seeking to enhance their solar observation setup with double-stacking capabilities. Additionally, it caters to individuals who already possess a Lunt blocking filter.
  • Compatibility with Lunt Blocking Filter: It is essential to use a Lunt blocking filter in conjunction with Lunt Ha filters at all times to ensure safe and effective solar observation.
  • Optical Performance: The 100mm aperture of the LS100FHa Solar Filter enables detailed views of both solar surface and edge features, providing observers with a comprehensive and immersive solar viewing experience.
  • Construction Quality: Crafted with precision and quality materials, the LS100FHa is designed to meet the rigorous standards of solar observation equipment, ensuring durability and reliability during use.


What's Included:

✓ Lunt LS100FHa 100mm Solar Filter

✓ Instructional Manual

✓ Lunt 5 Year Warranty



  • Optical Aperture: 100 mm
  • Etalon: Internal <0.7 Angstrom
  • Tuning: Tilt
  • Storage: Aluminum finished hard case with fitted foam
  • Weight: 8 lb.



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