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
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.
Optical 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.
Mounting and focusing
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.
Essential solar configuration
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.
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.
Additional specifications
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
SW0520
Data sheet
Aperture (mm)
100
Etalon
Solis, pressure tuned
Eyepiece
22 mm, 70° ultra-wide
Finder
Solar guider
Focal length (mm)
760
Focal ratio
f/7.6
Model
Heliostar 100 Hα — dedicated hydrogen-alpha solar telescope
Optical design
Dedicated hydrogen-alpha solar telescope
OTA length (mm)
760
OTA weight (kg)
6
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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
