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Lunt - 100mm H-alpha Solar-Telescope with B1800 Blocking Filter


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Availability: In stock


Manufactured by: Lunt Solar Systems


The LS100THa/B1800/FT is a complete Solar Telescope. The refractor based system has a precision aligned singlet chromatic lens with a 100 mm aperture. The front singlet lens reduces the stray-light over an achromat by half. With its matched collimation lens set, it also fully corrects on-axis coma, astigmatism and de-centering aberrations and provides a full spherically corrected flat-field Solar-Telescope. The focal length is 714mm providing a ~7.3 mm image thru an included 18mm blocking filter. Coarse focus adjustment is via a slide tube. Focusing is achieved with a high precision 2″ Starlight Instruments FeatherTouch dual speed focuser  10:1 reduction as standard equipment.

An internal etalon with Pressure Tune Adjustment allows for a <0.7 Angstrom bandpass.  The Etalon filter adjustment is NOT  tilted to only simulate a balance to the air pressure, but the air pressure in the filter system will adjust to 100 percent to the actual external air pressure. Thereafter the air surrounding the Etalon can simply be compressed or decompressed by the tuning system in order to change the air pressure between the surfaces. This allows the Etalon surfaces to always remain at the same perfect angle to the light waves.

Lunt Solar Systems'  Doppler  Pressure Tuning method allows the user to rapidly scan the scope’s sub-angstrom passband over the hydrogen alpha wavelength. Simply put, the advanced technology of Doppler True Tuning for fine adjustment of the center wavelength allows research of the Sun’s disk and surface details at increased image scale. Prominences, flares, super granulation, filaments, and active regions will be seen or imaged with amazing precision.  The LS100THa can be internally double stacked (see LS100Ha/PT/DSII) at time of purchase or anytime thereafter which reduces the bandpass to <0.5 Angstroms.  Doublestacking provides a truly enhanced high definition view of the Suns' surface details.  The Scope does not need to be returned to the factory for doublestacking as long as you have the red anodized front cell on your telescope.  If you have an older model (just a white tube with no red) you will need to upgrade the scope before using the internal double stack DSII-LS100T. 

* BLOCKING FILTERS are REQUIRED on all Lunt Solar Telescope Systems *
Lunt Solar Systems currently offers 4 blocking filter apertures for use with our Etalon systems. The Blocking Filter houses additional filters which are required for the safety and performance of the solar package.  Lunt Solar blocking filters contain a unique filter system. Lunt will only warranty safety or performance when a Lunt blocking filter is paired with a Lunt H-alpha filter or telescope.

 Required Blocking Filter:

  • B1200 for standard visual use  (scope focal length up to 1200mm)  optional
  • B1800 for larger field of view - viewing and imaging applications (Included)
  • B3400 even  larger field of view and imaging applications (available only in extension tube or "straight-thru" design) optional

When imaging with a Lunt Solar System 
it is recommended that the user opt for the next larger Blocking Filter than that recommended for Visual use.  This is due to the fact that most Imaging Systems require additional “backfocus”.  This requires that the Blocking Filter be moved further up the light cone. As a result the aperture of the Blocking filter needs to be larger to allow for the larger cone size.


  • The Lunt Solar Systems LS100THa Hydrogen-Alpha Telescope comes with a precision aligned 100mm singlet chromatical lens. 

  • Internal etalon system with tune adjustment that allows a maximum of <0.75 Angstrom bandpass. The internal module has an optimized collimating system to reduce off axis aberration.

  • This Lunt 100mm Hydrogen-Alpha Telescope has a focal length of 714mm.

  • This model includes a 2" dual speed 10:1 Feathertouch focuser, a clam shell mounting ring, sun finder, B1800 blocking filter, and a foam-lined case.

LS100T Features: (single stacked)

  • Optical Aperture: 100mm
  • Etalon: Internal <0.7 Angstrom
  • Tuning: Internal Pressure Tune (Doppler True Tuning)
  • Focal Length: 800mm
  • F Ratio: F/7
  • Focuser: 2″ Feather-Touch focuser with 10:1 reduction
  • Tube diameter: 121mm
  • Tube length with blocking filter: 634mm
  • Storage: Aluminum finished hard case with fitted foam
  • Weight: 13 lbs


 Included Accessories: 

  • Optical tube with 2″ feather touch focuser with 2.5″ travel,
    includes adapter
  • B1800 Blocking Filter
  • Sun Finder: Televue Sol Searcher
  • Mounting: Lunt 12″ Dovetail
  • Case: Aluminum Finished Hard Case with Custom Foam











Additional Information

Name Lunt - 100mm H-alpha Solar-Telescope with B1800 Blocking Filter
Manufacturer Lunt Solar Systems
Model LS100THa/B1800
Aperture 100mm
Bandwidth <0.75Å
Bandpass Blocking Filter in Lunt diagonal B1800 (18mm)
Barrel diameter 2"
Caps Y
Carrying Case Aluminum
Central obstruction Unobstructed
Collimation Cap Internal Optimized collimation system
Dovetail Compatibility Losmandy
Etalon Internal w/ pressure tuning
Fine Focus yes
Focal Length 714mm
Focal Ratio f/7
Focuser FeatherTouch
Objective Precision singlet chromatical
Optical Coatings Multi
Spectrum centered on 656.28nm
Star Diagonal Lunt
Warranty 5 Yr
Weight in Use 13 lbs