Sky-Watcher Solar telescope Heliostar 100Ha (SW-3504)

Sky-Watcher Heliostar 100Ha Solar Telescope (SW-3504)

The Sky-Watcher Heliostar 100Ha is a dedicated solar telescope designed for safe observation of the Sun in the hydrogen-alpha (H-alpha) wavelength. Engineered specifically for viewing solar prominences and fine surface details, it delivers exceptional performance with a bandpass of less than 0.5 Å, providing image quality comparable to much more complex dual-etalon ("Double Stack") systems.

Observing the Sun through the narrow H-alpha spectrum reveals spectacular dynamic features that are invisible in white light. Users can enjoy detailed views of solar prominences, flares, filaments, spicules, surface granulation, sunspots, and other forms of solar activity.

Key features

• Dedicated H-alpha solar telescope.

• 100 mm aperture.

• 800 mm focal length (f/8).

• Bandpass below 0.5 Å.

• Pressure tuning system.

• Sky-Watcher Solis Etalon technology.

• Sky-Watcher Trifid Tuner.

• Integrated 20 mm blocking filter.

• Built-in Safe Solar Finder.

• 2-inch Crayford focuser with dual-speed microfocus.

• Premium 20 mm wide-angle eyepiece included.

• Vixen-style dovetail mounting plate.

• Carrying handle and tube rings.

• Protective transport case included.

Designed for high-contrast H-alpha solar observation

The Heliostar 100Ha is specifically designed for observing the Sun in the hydrogen-alpha wavelength of 656.28 nm.

Unlike standard solar filters that only reveal sunspots, the H-alpha optical system allows observation of the Sun's dynamic atmosphere, revealing features such as:

• Solar prominences.

• Solar flares.

• Filaments.

• Spicules.

• Surface granulation.

• Sunspots.

• Other chromospheric activity.

The narrow spectral bandpass provides outstanding contrast and exceptional detail across the entire solar disk.

Advanced solar safety system

The Heliostar 100Ha incorporates multiple optical safety technologies to protect the observer during solar viewing.

The optical system includes:

• Infrared heat-reflecting filter.

• Dedicated heat-blocking filter.

• Ultraviolet blocking filter.

• Additional filters that suppress stray light and improve image contrast.

The combination of front-mounted and rear-mounted filters transmits only monochromatic light at 656.28 nm, while blocking all other wavelengths.

This optical design enables safe observation of the Sun when the telescope is used according to the manufacturer's instructions.

The Heliostar 100Ha complies with the requirements of ISO 12312-2:2015 for filters intended for direct solar observation.

Sky-Watcher Solis Etalon technology

The telescope incorporates Sky-Watcher's proprietary Solis Etalon technology, allowing it to achieve a bandpass below 0.5 Å without requiring an expensive secondary etalon.

This enables users to obtain highly detailed solar images immediately without additional upgrades or complex optical configurations.

The integrated pressure tuning system allows precise adjustment of the etalon for optimum image contrast.

Premium optical and mechanical design

The Heliostar 100Ha features a precision 2-inch Crayford focuser with dual-speed fine focusing for accurate image adjustment during visual observation or imaging.

An integrated Safe Solar Finder allows convenient alignment without looking directly at the Sun.

The optical tube is supplied with mounting rings, a carrying handle, and a Vixen-style dovetail rail for compatibility with a wide range of astronomical mounts.

Included accessories

• Vixen-style dovetail rail.

• Aluminum transport case.

• Tube mounting rings.

• Carrying handle.

• 20 mm wide-angle eyepiece (70° apparent field of view).

• 90° diagonal with integrated 20 mm blocking filter.

Technical specifications

Optical system

• Telescope type:

  • Dedicated H-alpha solar refractor.

• Aperture:

  • 100 mm.

• Focal length:

  • 800 mm.

• Focal ratio:

  • f/8.

• Bandpass:

  • Less than 0.5 Å.

• Operating wavelength:

  • 656.28 nm (Hydrogen-alpha).

Integrated technologies

• Solis Etalon.

• Trifid Tuner.

• Pressure tuning system.

• Safe Solar Finder.

Optical accessories

• Included eyepiece:

  • 20 mm wide-angle.

  • 70° apparent field of view.

• Magnification with supplied eyepiece:

  • 36×.

• Blocking filter:

  • 20 mm.

  • Integrated into the 90° diagonal.

Focuser

• Type:

  • Crayford.

• Diameter:

  • 2 inches.

• Fine-focus adjustment:

  • Yes.

Mechanical specifications

• Optical tube length:

  • 760 mm.

• Optical tube weight:

  • Approximately 6.0 kg.

• Mounting system:

  • Tube rings.

  • Carrying handle.

  • Vixen-style dovetail rail.

  • 1/4-inch tripod thread.

Mount

• Mount included:

  • No.

Warranty

• Manufacturer's warranty:

  • 60 months.