Lunt 100mm Solar Telescope – 18mm Blocking Filter – Feather Touch Focuser – Zoom Eyepiece

Code: LS100THa-3


Within the continental United States for orders over $100.00.

  • 100 mm f/7 dedicated h-alpha telescope
  • Internal etalon allows a <0.75 Angstrom bandpass.
  • True Doppler pressure tuning system for precision tuning adjustments.
  • 2″ Starlight Instruments Feather Touch Focuser
  • B1800 Blocking Filter
  • Zoom Eyepiece
  • Aluminum case
  • Sun- finder
  • 12″ dovetail

A blocking filter is required with this system.



Out of stock




Walkthrough of the Lunt 100mm H-Alpha Pressure Tuned Solar Telescope. Learn about the telescope and which options are right for you for:

Blocking Filters
Dovetail Mount

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Get a 360° View of the Lunt Solar Systems 100mm Pressure-Tuned H-Alpha Solar Telescope

All LS100THa solar telescopes require a blocking filter.

Which blocking filter is right for you?

  • B1200 – for visual use
  • B1800 – for larger field of view and imaging applications
  • B3400 – for larger field of view and imaging applications with larger sensors

Images taken through this telescope

LS100THa Solar Telescope

The Lunt LS100THa solar telescope  is a complete solar telescope. This refractor-based system has a precision-aligned doublet ED lens with a 102 mm aperture.  Furthermore, the focal length is 714 mm, for an f/ratio of 7. Additionally, the course focus adjustment is made via a slide tube. While focusing is achieved with a high precision 2″ Starlight Feather Touch  focuser with 10:1 reduction as standard equipment. Most importantly, an internal etalon with tune adjustment allows for a <0.7 Angstrom bandpass.

True Doppler Tuning

Importantly, True Doppler Tuning allows for a shift into and away from the user, adding a 3-D like component to the viewing experience. To be sure, it has minimal effect on proms due to their location at the edge of the disk, but it does have an effect on filaments and likewise the active regions on the surface. Also while looking at a filament at the center of the Sun, the user has the ability to Doppler shift from the base of the filament to the tip.  In this way following the filament through it’s structure toward you and away from you.  Amazingly, this allowing for enhanced visual and imaging capability for the observer as well as a research tool for the avid hobbyist. In addition the pressure tuning system provides an order of magnitude more precision to the tuning of the desired features.

LS100THa Solar Telescope Specifications: (single stacked)

  • Optical Aperture: 102 mm
  • Etalon: Internal <0.7 Angstrom
  • Tuning: Internal Pressure Tune (Doppler True Tuning)
  • Focal Length: 714 mm
  • F Ratio: F/7
  • Focuser: 2″ Feather-Touch focuser with 10:1 reduction
  • Tube diameter: 121 mm
  • Tube length with blocking filter: 634 mm
  • Storage: Aluminum finished hard case with fitted foam
  • Weight: 12.2 lb

Included Accessories

  • Optical tube with 2″ Feather Touch focuser with 1.5″ travel
  • B1800 Blocking Filter
  • Zoom Eyepiece
  • Sun Finder: Televue Sol Searcher
  • Mounting: Lunt 12″ Dovetail
  • Case: Aluminum Finished Hard Case with Custom Foam

Current news about the sun from NASA

Additional information

Weight 40 lbs
Dimensions 37 × 15 × 19 in

B1200 Package – with 12mm Blocking Filter Diagonal, B1800 Package – with 18mm Blocking Filter Diagonal, B3400 Package – with 34mm Straight-Thru Blocking Filter, No Blocking Filter – See Warnings for this Choice


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