solar telescopes

Lunt Solar 100mm H-Alpha Solar Telescope

Lunt Solar Systems   ——   SKU: LUN-LS100THa/B1200
$6,489.00 CAD
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Product Info


About the Lunt 100mm H-Alpha Solar Telescope...

The Lunt LS100THa H-Alpha Solar Telescope is a Lunt H-Alpha Solar Telescope with a 100 mm aperture (no obstruction!) and 800 mm focal length. An internal etalon with new air-pressure tuning system adjustment allows for a Lunt Solar Telescope equipment.

The Lunt LS100THa H-Alpha Solar Telescope is available with B1200, B1800 or B3400 Lunt Solar Blocking Filters. We recommend the B1800 for imaging. The giant B3400 blocking filter in straight 2" extension tube is optimal for imaging with very big CCD imagers. Also with these large telescopes the double stack method can be applied to reduce the bandwidth. 

What is the pressure tuner on the Lunt LS100THa H-Alpha Solar Telescope? The air pressure of the atmosphere varies, depending on if you are at sea level or on a mountain. Unfortunately also the sensitive Lunt Solar Telescope Etalon filter systems respond to these air pressure variations. The wavelength range that is allowed through the filters, shifts as a function of the air pressure. This shifting is indeed minimal, but at bandwidths of less than one Angstrom it is already clearly visible. If the filter is not adjusted precisely to the H-alpha wavelength, the image of the sun through the Lunt Solar Telescope degrades, prominences and surface details are no longer visible. Therefore, the Etalon filter systems have to be adjusted to the prevailing air pressure at the observation location. This "Tuning" called adjustment is typically done by a mechanical tilting of the filter. At sizes of a few Angstrom, it is obviously not easy to achieve the exact adjustment by mechanical tilting. And because the filter is no longer perfectly straight in the beam path, but slightly oblique, there may also be optical failures.


The new air-pressure system "Pressure Tuner" by Lunt Solar Systems and offered with the Lunt LS100THa H-Alpha Solar Telescope takes a different path. The Etalon filter will not be tilted to only simulate a balance to the air pressure, but the air pressure in the filter system is in fact adapted by 100 percent to the real external air pressure. Thereafter the air surrounding the Lunt Solar Telescope Etalon can simply be compressed or decompressed by the tuning system in order to change the air pressure between the surfaces. This allows the Etalon surfaces to always remain at the same perfect angle to the light waves but changes the diffractive index of the air in the chamber and thus accomplishes the same tuning expect that it goes around + or - 0.4 Angstrom on either side of the centerline. Therefore, the patent-pending "Pressure Tuner" system from Lunt Solar Telescope is also called "True Doppler Tuning", and it achieves much better results than conventional tuning systems. 

Lunt 100mm H-Alpha Solar Telescope Features... 

  • "Pressure Tuner" system adapted the Etalon to varying altitudes and atmospheric pressures for always optimal performance


  • 100 mm aperture (no obstruction!) and 800 mm focal length


  • "True Doppler Tuning" achieves much better results than conventional tuning systems


  • Professional accessories such as Feather-Touch focuser from Starlight Instruments, sol searcher from TeleVue, and the new air-pressure tuning system "Pressure Tuner", belongs to the standard equipment

  • Tube rings with dovetail plate and a robust transport case are included in the package



Lunt 100mm H-Alpha Solar Telescope Specifications...

Aperture: 100 mm

Focal length: 800 mm

Tuning: air-pressure tuning system

Focuser: Starlight Instruments Feather Touch with 10:1 reduction

Weight: 6.4 kg

Length: 62 cm

Lunt Product Number: LS100THa/B1200, B1800 or B3400, depending on your choice of blocking filter.

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