80mm H-alpha Telescope, B1200, Crayford focuser and Pressure Tuner

LUNT LS80THa/B1200CPT (0551307)

Complete H-alpha Solar Telescope with 80mm aperture and <0.7 Angstrom bandwidth. With new air-pressure tuning system, zoom eyepiece, Sol-Searcher, and B1200 Blocking Filter.

€ 4.795,00*
excl. delivery costs
Availabilty: Delivery time about 4 weeks Add to Basket

Delivered by order

  • H-alpha Telescope with internal Etalon and 80mm Aperture
  • Pressure Tuner system
  • B1200 blocking filter in star-diagonal
  • Crayford focuser
  • Tube Ring with 1/4"-20 connection and dovetail plate
  • LUNT zoom eyepiece
  • Sol-Searcher
  • transport case

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 B1200. 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.
Technical data:
Aperture: 80 mm (ED refractor, unobstructed)
Focal length: 560 mm
Bandwidth: internal Etalon with <0,7 Angstrom
Tuning: air-pressure tuning system
Blocking Filter: B1200 with 1.25" and T2 connection
Focuser: Crayford-style with 10:1 reduction
Weight: 4 kg
The telescope is upgradeable with the new DSII double-stack system. The optional DSII is a internal double stack module with "Pressure Tuner", that provides a bandwidth <0.5 Angstrom. In addition to the "Pressure Tuner" has the DSII module the advantage that there are no more Energy-Rejection-Filter installed, unlike front-mounted double-stack filters. The ERF are allready in the telescope. Therefore the sun's image is brighter and prominences can be better observed than with conventional double-stack systems.

Suitable accessories:

80 mm 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.

All prices including German VAT, excl. handling and delivery costs (depending on weight and deliveryaddress).
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