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Lunt LS80THa/B1800CPT 80mm H-Alpha Telescope, Crayford Focuser, Pressure Tuner

Lunt LS80THa/B1800CPT 80mm H-Alpha Telescope, Crayford Focuser, Pressure Tuner
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Lunt LS80THa/B1800CPT 80mm H-Alpha Telescope, Crayford Focuser, Pressure Tuner
Ex Tax: £4,575.00
  • Stock: Ask About Stock
  • Model: LUNT-LS80THa-B1800-0551309
  • Shipping Weight: 5.80kg
  • SKU: LUNT-LS80THa-B1800-0551309
  • GTIN: 4007922035079
  • MPN: LUNT-LS80THa-B1800-0551309

- for visual observations and photography

(The FeatherTouch version is also available, please contact us for details...)

Complete H-Alpha Solar Telescope with 80mm aperture and <0.7 Angstrom bandwidth. With new air-pressure tuning system, zoom eyepiece, SOL-Searcher, and B1800 Blocking Filter that provides smaller vignetting for imaging, it is an exciting package to choose. A complete solar telescope kit for viewing and imaging the sun in H-alpha light.

The LS80THa is a complete Solar Telescope, a precision aligned ED refractor with a fully un-obstructed 80 mm optical aperture and 560 mm focal length. An internal etalon with new air-pressure tuning adjustment allows for a <0.7 Angstrom bandwidth. This "Pressure Tuner" system allows a better Etalon adjustment than other systems. The "Pressure Tuner" system adapted the Etalon to varying altitudes and atmospheric pressures for always optimal performance.

Blocking Filter is the B1800, that provides a smaller vignetting for imaging. The star diagonal in which the blocking filter is installed, is equipped as standard for 1.25" eyepieces and with a T2 camera connection.
Fine adjustment is achieved with a Crayford style focuser with 10:1 reduction.

LS80THa/B1800CPT Technical specifications (single stacked version):

  • Aperture: 80mm ED Refractor, Unobstructed Front Mounted Etalon
  • Bandwidth: <0.7 Angstrom internal etalon
  • Tuning: air-pressure tuning system
  • Focal Length: 560mm
  • Focuser: Dual-Speed with 10:1 reduction Crayford-style focuser
  • Blocking Filter: B1800 with 1.25" and T-2 connection
  • Colour: Pearl White with Black and Red Anodised Accents
  • Tube length: 39cm
  • Mounting: tube rings (optional dovetail plate available, see below recommended accessories)
  • Storage: case with die cut foam with room for accessories
  • Weight without rings: 4kg
This telescope can be upgraded with the new DSII system. The DSII system is an internal double stack modul with "Pressure Tuner" that provides a bandwidth of <0.5 Angstrom.
  • LS80T Hydrogen-alpha Solar Telescope with 80mm aperture and internal etalon
  • B1800 Blocking Filter in star-diagonal for enhanced viewing
  • Pressure Tuner System
  • 2-inch Dual-Speed Crayford Focuser 
  • Lunt Zoom Eyepiece
  • Tube Rings and dovetail plate with 1/4"-20 connection for mounting on photo-tripods
  • SOL-Searcher solar finder
  • Transporting case with die cut foam with room for accessories

Recommended (and suitable) accessories:

  • DSII Internal Double Stack Module for all Lunt Solar System telescopes with 80mm aperture  (available on back order, please contact us for details)

    DSII module for all Lunt Solar Systems telescopes with 80 mm aperture. Internal double stack filter with air-pressure tuning system. Reduces the bandwidth to <0.5 Angstrom!

Additional information about the LUNT LS80THa single stacked 80mm solar telescopes


For the advanced solar observer we offer this ED refractor with an aperture of 80 mm and 560 mm focal length, of course fully unobstructed. The H-alpha telescope is equipped as standard with the air-pressure tuning system "Pressure Tuner", whereby the internal Etalon achieves a bandwidth of <0.7 Angstrom. The telescope has both a 1/4"-20 connection for photo-tripods, and a dovetail plate for astronomical mounts. A Sol-Searcher, a zoom-eyepiece, and a transport case are also included.

Like the smaller LS60THa this telescope is available alternatively with different blocking filters (B1200 or B1800), and with standard Crayford or Feather Touch focuser.

This telescope is already prepared for the new double stack system DSII from Lunt Solar Systems. The DSII eliminates the need for an external front mounted filter for double stacking. In this system both Etalons are internally installed in the telescope, and both Etalons are equipped with the tuning system "Pressure Tuner"!

What is the "Pressure Tuner" system?

The air pressure of the atmosphere varies, depending on if you are at sea level or on a mountain. Unfortunately also the sensitive 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 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 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 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 Systems is also called "True Doppler Tuning", and it achieves much better results than conventional tuning systems.

General Information
Weight in Kg5.8

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