Lunt LS100THa Solar Telescope

Code: N/A
Rated 5.00 out of 5 based on 3 customer ratings
(3 customer reviews)


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.
  • The LS100THa includes a 2″ Starlight Instruments Feather Touch Focuser, aluminum case, a sun- finder, 12″ dovetail and your choice of blocking filter.

A blocking filter is required with this system.



In stock (can be backordered)




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

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
  • No Blocking Filter – only choose this package if you already have a Lunt Solar Systems blocking filter at your disposal.  All Lunt Solar Systems h-alpha telescopes require a Lunt Blocking Filter!

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
  • B1200, B1800 or B 3400 Blocking Filter
  • 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 34 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

3 reviews for Lunt LS100THa Solar Telescope

  1. Rated 5 out of 5


    Have been using this scope for over a year. Totally tricked out with the FT focuser, B1800 BF, and DSII module.
    All I can say is wow, wOW, and WOW. I’m mainly a visual observer so chose this particular model as its the
    minimum size required to see spicules (fuzz around the suns edge).
    Do yourself a favour and hang a binoviewer off it. I do and to be honest I could sit and stare at the sun all day!
    Pressure tuning, yes that’s the only way to fly!

    This scope is a keeper, forever. Thanks Lunt!

  2. Rated 5 out of 5

    M. Kedzior

    My first Lunt product was the LS35THa/B600 Deluxe – I was and still am impressed with the views and craftsmanship of this instrument -looking forward to viewing our nearest star with this upgrade in aperture and the pressure tuning system – this instrument is also machined beautifully – will be placing a order shortly to get on the waiting list for the double stack filter that goes with this unit – Thank you Lunt Solar Systems!

  3. Rated 5 out of 5

    J. Neville

    LS100THa/B1200 Very happy to have bought it way back in March 2011. Everything that you promised and more!

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  • Internal Double Stack Module
    DSII Internal Modules

    DSII/LS100THa – Internal Double Stack Module for LS100THa

    • Add an internal double-stacking module to a Lunt LS100THa solar telescope for a lowered bandpass of <0.5 Angstroms!
    • The LS100THa DSII includes a pressure tuner for true Doppler tuning.
    • Add the DSII to a new LS100THa at the time of order, or add it yourself to your own LS100THa, no trip back to the factory required!

    Please Note: If this product shows “Available on Backorder” and you would like to “get in line” by placing an order with a 10% deposit, send us an email.   A member of our staff will contact you with lead times and deposit information.

    Estimated lead time:  1-2 Months


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