Heliostar 100 Hα — dedicated hydrogen-alpha solar telescope The Heliostar 100 is a dedicated 100 mm hydrogen-alpha solar telescope with a 760 mm focal length and a bandpass below 0.5 Å. It is designed to reveal prominences and solar hydrogen-alpha detail using its integrated filtering system.
Manufacturer model: Heliostar 100 Hα — dedicated hydrogen-alpha solar telescope · Specifications checked against manufacturer data on 2026-11-04
The Heliostar 100 is a dedicated 100 mm hydrogen-alpha solar telescope with a 760 mm focal length and a bandpass below 0.5 Å. It is designed to reveal prominences and solar hydrogen-alpha detail using its integrated filtering system.
The 100 mm model uses a pressure-tuned Solis etalon and a 20 mm blocking filter in its dedicated solar diagonal. Sky-Watcher gives a 7.6 mm solar image and 20 mm backfocus.
The OTA weighs 6 kg and measures 760 mm according to the product specification. Its solar guider provides aiming assistance; tune and focus using the manufacturer’s operating procedure.
Observe only with the complete, undamaged original solar-filter system and its dedicated solar diagonal fitted as instructed. Replacing the solar diagonal with an ordinary star diagonal removes essential filtering. Read the manufacturer’s solar operating instructions before use.
Sky-Watcher manufacturer documentation
Dedicated H-alpha configuration only. The 20 mm blocking filter is part of the necessary original solar diagonal, not a normal diagonal or white-light filter.
| Bandpass angstrom | Less than 0.5 |
|---|---|
| Observing line (nm) | 656.28 |
| Solar image diameter (mm) | 7.6 |
| Solar diagonal | Dedicated solar zenith prism/blocking-filter assembly; essential to complete filtering system |
| Safe configuration | Use only the complete original solar-filter system; never substitute an ordinary star diagonal |
| Blocking filter diameter (mm) | 20 |
| Backfocus (mm) | 20 |
Ficha técnica
Heliostar 100 Hα — dedicated hydrogen-alpha solar telescope The Heliostar 100 is a dedicated 100 mm hydrogen-alpha solar telescope with a 760 mm focal length and a bandpass below 0.5 Å. It is designed to reveal prominences and solar hydrogen-alpha detail using its integrated filtering system.
Manufacturer model: Heliostar 100 Hα — dedicated hydrogen-alpha solar telescope · Specifications checked against manufacturer data on 2026-11-04
