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A very compact, complete telescope for observing the sun in H-alpha light

Colour Base color
Retail price:
The price is valid only for the online store and may differ from the prices in retail stores.
All specifications

The LS50THa solar telescope offers 50mm free aperture, 350mm focal length, and provides a bandwidth of <0.75 Angstrom. The telescope is fitted as standard with the air-pressure tuning system "Pressure-Tuner", the Etalon is safely installed inside the telescope. Prominences and surface detail can quickly be viewed spontaneously. This very portable system is an ideal travel companion for wherever you go.

A B600 blocking filter is installed inside the star diagonal. The B600 offers a larger field of view than the smaller B400 and is very good for visual solar observing. Focusing is achieved by a non-roting Helical focuser.

Please note that there is only a small back-focus at this telescope, therefore solar-imaging is very difficult. The LS50THa is designed for visual solar observing. We recommend for imaging the 60mm telescopes LS60THa.

Also double-stacking with a bandwidth of only <0.5 Angstrom is possible by using the additional available LUNT LS50C H-alpha Double-stack Solar Filter. This filter threads directly onto the LS50THa telescope. Double-stacking will provide much more contrast, and more details on the sun will become visible.


  • Aperture: 50mm
  • Focal Length: 350mm
  • Bandwidth: <0.75 Angstrom
  • Tuning: air-pressure tuning system "Pressure-Tuner"
  • Blocking Filter: B600
  • Non-rotating Helical focuser
  • Tube-ring with 1/4"-20 tapped base (standard thread for photo-tripods)

The kit includes:

  • LS50THa H-alpha Solar Telescope
  • B600 Blocking Filter in star-diagonal
  • Pressure-Tuner
  • Tube ring with 1/4"-20 connection for mounting on photo-tripods
  • Non-rotating Helical focuser
  • Instruction manual