LUNT LS40THa/B500 H-alpha Solar Telescope

LUNT LS40THa/B500 H-alpha Solar Telescope

  (1 Review)
✓ 2 year warranty


Out of stock due 15-20 working days

About this product

Model:  lunt_ls40tha_b500
Part Number:  0551145

LUNT LS40THa/B500 H-alpha Solar Telescope

Solar observation in H-Alpha: prominences, filaments, flares ... the most spectacular way to see the Sun - easy and affordable with the LS40THa.

Complete H-alpha solar telescope with 40mm aperture, <0.7 Angstrom bandwidth, B500 blocking-filter, and Helical focuser.

The LS40THa/B500 is a complete telescope for observing the sun in H-alpha, with 40mm aperture (no central obstruction) and 400mm focal length. The H-alpha wavelength is the most impressive way to observe the sun, showing protuberances at the sun's edge, filaments and flares on the surface, and much more. An Etalon with mechanical tilt-tuning provides <0.7 Angstrom bandwidth.
Fine adjustment is achieved with a 1.25 inch Helical focuser. Blocking-filter is the B500, this is good for visual observation of the sun. The star diagonal in which the blocking filter is installed, is equipped as standard for 1.25 inch eyepiece connection.
The easy handling makes this telescope ideal for starting H-Alpha solar observation. Due to its compact dimensions it is also a good travel telescope for the experienced solar observers.
The LS40THa telescopes are available with choice of B500, B600 or B1200 blocking filters. The larger blocking filters provide less edge obstruction and a larger field of view for visual observation and photography. Please note that these telescopes have only a very small back focus and therefore photography is difficult. We recommend special astro cameras for photography, which have a very short distance to the sensor.
  • Aperture: 40mm (no central obstruction, 2-lens refractor)
  • Focal length: 400mm
  • Bandwidth: <0.7 Angstrom
  • Tuning: mechanical tilt-tuning
  • Blocking filter: B500 with 1.25 inch connection
  • Focuser: Helical focuser
  • Dovetail bar at standard GP-level
  • 1/4-20 tapped base (standard thread for photo-tripods)
  • Sol-Searcher included
  • Weight: 1.2kg
  • Length: 41cm

What's in the box

  • LS40THa Solar Telescope
  • B500 blocking filter in star-diagonal housing
  • 1.25 inch Helical focuser
  • Dovetail bar (GP level)
  • Sol-Searcher
  • Instruction manual


Aperture 40mm - No Central Obstruction
Bandwidth <0.7 Angstrom
Tuning Mechanical Tilt Tuning
Blocking Filter B500 with 1.25" Connection
Focuser Helical Focuser
Dovetail Bar Standard Vixen Style
Photo Tripod Thread 1/4-20 tapped base
Finder Sol Searcher
Weight 1.2kg
Length 41cm
Observation Prominences and Details on The Sun
Warranty 5 years

Customer reviews

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Stonking little scope! Everything all at once.
03 October 2023  | 

This blew me away and I've a Quark on the end of my 6" refractor and white light stuff on my C9.25.
I wasn't expecting this from a small 40mm grab n go!

To see the entire Sun today with a forest of massive prominences interwoven with ghostly tendrils, dark filaments, bright active regions, everything all at once - except a CME.
If there was a CME this little thing would show it all. Sometimes less is more.

First time I've ever looked through a Lunt or used any tilt tunable filter. You can whack the filter fully one way to get the brightest crispest prominences I've ever seen, at the expense of loosing surface detail.
Getting it "on band" to nail the exact Ha line is a breeze. You need to know what you're looking for and I highly recommend Solar Chat or Cloudy Nights [Solar Observing and Imaging] for reference.

I used an old Vixen 1.25" 2x barlow + Svbony 25mm Plossl and had a wonderful full disk which gave me the biggest smile and the happiest 15 minutes of the entire year.

I did struggle with "black out" and figured my constricted pupil was the issue.
I covered my head with a jacket, let my pupil dilate in the relative dark, tried again and...boom! My expletive of joy could probably be heard for miles.

To buy astonishment at this price is ridiculous.


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