LUNT LS40THa/B1200 H-alpha solar telescope

product code: 0551147
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LUNT LS40THa/B1200 H-alpha solar telescope
  • Special telescope for observing the sun
  • Absolutely safe, no danger to the eyes
  • Shows prominences & more details on the sun
  • Easy to use, well suited for beginners
  • For visual sun observation
  • Bandwidth less than 0.7 Angstrom
  • Large B1200 blocking-filter

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, B1200 blocking-filter, and Helical focuser.

The LS40THa/B1200 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 B1200, this is excellent 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, such as the BRESSER Full HD camera item number 4959050.


  • Aperture: 40mm (no central obstruction, 2-lens refractor)
  • Focal length: 400mm
  • Bandwidth: <0.7 Angstrom
  • Tuning: mechanical tilt-tuning
  • Blocking filter: B1200 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

  • LS40THa Solar Telescope
  • B1200 blocking filter in star-diagonal housing
  • 1.25 inch Helical focuser
  • Dovetail bar (GP level)
  • Sol-Searcher
  • Instruction manual

Technical Data

Field of application Solar observation
Mirror/Lens diam. 40 mm
Focal length 400 mm
Aperture ratio 10
Angular resolution 3.45 arc seconds
Full width at half maximum (Angström), less then 0.7
Focusing system 1.25" Helical focuser
Mount Type Optics without Mount
Extended warranty 5 years
Total length 41 cm
Total width 8 cm
Total height 11.5 cm
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Brand Lunt
Product Code 0551147
Weight 3.6kg