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Sky-Watcher Heliostar 100Ha Solar Telescope

Sky-Watcher Heliostar 100Ha Solar Telescope

by Sky-Watcher
SKU SW-S11325
$5,995.00 USD - $7,995.00 USD
$5,995.00 USD
$5,995.00 USD - $7,995.00 USD
$5,995.00 USD
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  • 100mm Primary Aperture
  • 760mm Focal Length (f/7.6)
  • Etalon Bandwidth Under 0.5Å
  • 20mm H-alpha Blocking Filter
  • 2" Dual-Speed Crayford Focuser
  • Includes 22mm Eyepiece and Hard Case
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  • Description
  • FAQ
  • Specifications
  • In the Box
  • Downloads
  • Warranty

  • Sky-Watcher Heliostar 100Ha Solar Telescope

    The Sky-Watcher Heliostar 100Ha is a 100mm hydrogen-alpha solar telescope with an achromatic doublet objective, a 760mm focal length (f/7.6) and an etalon bandwidth under 0.5 Angstrom. It gives a 7.6mm solar image, and its 20mm blocking filter sits in the removable 1.25" eyepiece diagonal. The 13.2 lb tube comes with a 22mm 70° eyepiece, mounting rings, a solar finder and a hard carrying case.

    100mm f/7.6 H-Alpha Optics

    Sky-Watcher designs it for serious solar observers and imaging enthusiasts. A combination of front and rear filters passes only monochromatic 656.28 nanometer light emitted by hydrogen atoms and blocks other wavelengths, allowing observation of active prominences in the H-alpha band.

    H-alpha observing shows the dynamics of the Sun far beyond what a white-light solar filter can deliver: prominences on the limb (often mistakenly called flares), active sunspot regions, bright plage patches, surface granulation and wispy, snake-like plasma filaments.

    Solis Etalon: Under 0.5Å With One Etalon

    Sky-Watcher's Solis etalon technology reaches a 0.5Å bandpass without the cost and complexity of a second etalon, so you can get detailed images of the solar disk right out of the box without further expense.

    The etalon is pressure tuned, and the back focus is 20mm. The 20mm blocking filter is in the removable eyepiece diagonal.

    ISO 12312-2:2015 and Safety

    The Heliostar 100Ha conforms to and meets the transmission requirements of ISO 12312-2:2015 (filters for the direct observation of the Sun). Always use it in accordance with the instructions and exercise the utmost caution when viewing the Sun.

    It uses several technologies to protect the eye during solar observation: an infrared thermal ray reflection film, a special filter to block heat, and a filter to block UV light, which also block stray light that affects observation. Improper usage and practices can result in serious and even permanent eye damage.

    • Blocking diagonal: the 20mm blocking filter in the removable eyepiece diagonal is part of the Heliostar's safety features.
    • Warning: Do not use this telescope with any other type of diagonal.

    Focuser and Pressure Tuning

    It has a 2" dual-speed Crayford focuser, and a 2" to 1.25" adapter is included for the 1.25" diagonal and eyepiece.

    The etalon is adjusted by pressure tuning.

    A 7.6mm Solar Image

    The solar image is 7.6mm across, and the included 22mm 70° UltraWide eyepiece gives 34.5x.

    Imaging

    Sky-Watcher designs the Heliostar 100Ha for serious solar observers and imaging enthusiasts, and lists a back focus of 20mm.

    A 13.2-Pound Tube, Rings and Case

    The tube weighs 6 kg (13.2 lb) and is 760mm (30 inches) long. It attaches to the mount with the included rings and V-style dovetail plate, so use a mount with a Vixen-style saddle and a payload rating that covers it. A hard carrying case is included.

    Solar Finder and Accessories

    The Heliostar 100Ha comes with a full suite of accessories, including a 22mm 70° wide-angle eyepiece, a solar zenith prism and a solar guider.

    The solar guider aims the telescope at the Sun without looking through it. A clip-on sun shade and a 2" to 1.25" adapter are also included.

  • What can I see in H-alpha that a white-light filter does not show?

    H-alpha shows far more than a white-light filter: prominences on the limb, active sunspot regions, bright plage, surface granulation and snake-like plasma filaments.

    Does it need a second etalon?

    No. Sky-Watcher's Solis etalon technology reaches a 0.5Å bandpass without a second etalon.

    What mount does it need?

    The tube weighs 6 kg (13.2 lb) and comes with rings on a V-style dovetail plate, so use a mount with a Vixen-style saddle and a payload rating that covers it.

    How do I find the Sun safely?

    Use the included solar guider, which lets you aim at the Sun without looking through the telescope.

    Can I use a different diagonal?

    No. You must use the included diagonal: its 20mm blocking filter is part of the Heliostar's safety features, and the telescope must not be used with any other type of diagonal.

    Can I use the Sky-Watcher Heliostar 100Ha for night sky observing?

    No. It is a dedicated hydrogen-alpha solar telescope.

    What magnification does the included eyepiece give?

    34.5x with the 22mm 70° eyepiece.

    Does it meet a solar filter standard?

    It conforms to and meets the transmission requirements of ISO 12312-2:2015 (filters for the direct observation of the Sun). Always use it in accordance with the instructions and exercise the utmost caution.

    How is the etalon tuned?

    By pressure tuning.

    What is the back focus?

    The back focus is 20mm.

    Is a sun shade included?

    Yes. A clip-on sun shade is included; it attaches to the tube.

    What comes in the box?

    The Heliostar 100Ha tube, two mounting rings, a V-style dovetail plate, a 22mm 70° 1.25" eyepiece, the 1.25" H-alpha blocking diagonal, a solar finder, a clip-on sun shade, a 2" to 1.25" adapter and a hard carrying case.

  • UPC 810098970747
    Optical Design Achromatic Doublet
    Primary Aperture 100mm
    Focal Length 760mm
    Focal Ratio f/7.6
    Bandpass < 0.5Å
    Lens Coating H-alpha fully multicoated
    Blocking Filter Size 20mm
    Solar Image Size 7.6mm
    Focuser 2" Dual-Speed Crayford
    OTA Material Aluminum
    Optical Tube Length 30 inches
    Optical Tube Weight 13.2 pounds
    Mounting Mounting Rings with V-style Dovetail
    Magnification (with included eyepiece) 34.5x

    • Heliostar 100Hα Optical Tube Assembly

      × 1

    • Mounting Rings

      × 2

    • V-Style Dovetail Plate

      × 1

    • 22mm 70° Eyepiece (1.25")

      × 1

    • H-alpha Blocking Diagonal (1.25")

      × 1

    • Heliostar Solar Finder

      × 1

    • Clip-on Sun Shade

      × 1

    • 2" to 1.25" Eyepiece Adapter

      × 1

    • Hard Carrying Case

      × 1

  • Sky-Watcher 2-Year Warranty