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Lunt LS152THa B1200 152mm H-Alpha Telescope, Feather-Touch Focuser, Pressure Tuner

Lunt LS152THa B1200 152mm H-Alpha Telescope, Feather-Touch Focuser, Pressure Tuner
Lunt LS152THa B1200 152mm H-Alpha Telescope, Feather-Touch Focuser, Pressure Tuner
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Lunt LS152THa B1200 152mm H-Alpha Telescope, Feather-Touch Focuser, Pressure Tuner
Lunt LS152THa B1200 152mm H-Alpha Telescope, Feather-Touch Focuser, Pressure Tuner
Lunt LS152THa B1200 152mm H-Alpha Telescope, Feather-Touch Focuser, Pressure Tuner
Ex Tax: £9,174.17
  • Stock: Ask About Stock
  • Model: LUNT-LS152THa-B1200-0551501
  • Shipping Weight: 18.00kg
  • SKU: LUNT-LS152THa-B1200-0551501
  • GTIN: 4007922035147
  • MPN: LUNT-LS152THa-B1200-0551501
- the ultimate solar telescope for the visual observer!

Complete H-Alpha Solar Telescope with 152mm aperture and <0.65 Angstrom bandwidth. With Feather Touch focuser, new air-pressure tuning system and B1200 Blocking Filter. The large LS152THa is sure to provide a professional balance of resolution and performance!
If you have big plans for photographing the Sun, please buy the version with B1800 or  B3400 internal Etalon instead of this.

This large solar telescope is perfect for the ambitious solar observer! If it's a perfect image you're after, the LS152THa provides a very large and high resolution image size. The 100% unobstructed system will perform to the highest level at both low and high magnifications. Utilizing both advanced hi-contrast coatings, and the new Doppler True Pressure Tuning system, the user will be able to experience crisp, sharp, high magnification visual images, as well as utilize this system for high end digital processes. An internal etalon with new air-pressure tuning adjustment allows for a <0.65 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. The star diagonal in which the blocking filter is installed, is equipped as standard for 1.25" eyepieces and with a T2 camera connection. Focusing is achieved with a high precision Starlight Instruments 2" Feather Touch focuser with 10:1 reduction as standard equipment.

LS152THa / B1200 Technical specifications (single stacked version):
  • Advanced Narrow Band Hydrogen-alpha Dedicated System.
  • A refractor based system with a 152mm front objective.
  • An unobsructed internal HD Etalon with the new Pressure Tuner allows for <0.65 Angstrom bandwidth, providing slightly higher surface detail without the loss of edge detail.
  • The system includes the moutning rings and dovetail, dust caps, and is delivered in an Aluminum re-enforced case.
  • A Lunt Zoom eyepiece is included.
  • LS152 Hydrogen-alpha Solar Telescope with 152mm aperture and internal etalon
  • B1200 Blocking Filter in star-diagonal for enhanced viewing
  • Pressure Tuner System
  • 2-inch Feather-touch Focuser 
  • Lunt Zoom Eyepiece
  • Tube Rings and dovetail plate
  • Transporting case with die cut foam with room for accessories


Technical Specifications
Type: Single Interference HD Etalon
Tuning: air-pressure tuning system
Aperture: 152 mm
Focal Length: 900 mm
Focal Ratio: F6
Bandwidth: <0.65 Angstrom @ 656.28nm
Focuser: Starlight Instrument Feather Touch
Color: Pearl White with Black and Red accents
Weight: 14 kg
Diagonal: B1200 Blocking Filter (B1800 needed for imaging)

Also available for the system is an optional, interchangeable, CaK module allowing for the research of multiple wavelengths through the same platform.

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.

It's big brother, the LS230THa is also available, although we believe that that instrument is an overshoot for the average sky conditions in the UK, however, if you have a house in France or Spain or maybe Italy, you might consider that instrument as well. Otherwise the LS152THa is the biggest instrument that we will ever recommend for a British amateur. Scientific research might also benefit from a 230, but otherwise the 152 is a very good ultimate scope for the UK.

Recommended (and suitable) accessories:

  • Sol Searcher


    Sol-Searcher for mounting on all solar telescopes of Lunt Solar Systems. The tube rings of the LUNT solar telescopes are prepared for the mounting of this Sol-Searcher.

  • Ca-K Module for the LS152THa Telescopes

    The LS152THa telescopes could be upgraded with a optional, interchangeable Ca-K module allowing for the research of multiple wavelengths through the same telescope.

  • Adapter for installing a Sol Searcher at a LS152THa telescope

    This adapter is needed to use the Sol Searcher at the 6" H-alpha telescopes of the LS152THa series.

  • Crayford focuser with Adapter for LS152THa Telescopes

    The LS152THa telescopes could be retrofit with a optional focuser allowing for the observing of the starry night sky.

  • Adapter T2 to 2", takes 2" eyepieces to blocking filter

    You want to use your 2" eyepieces at Lunt Solar Systems telescopes or filters? All you need is this adapter. Simply remove the 1.25" eyepiece tube from your blocking filter and thread on this 2" adapter. It takes T2 threading to a 2" eyepiece tube.

  • Lunt Solar Hat with neck flap

    Keep your head covered and prevent sunburn while observing. UV protectant material with small pocket and clip to prevent being blown off in the wind. Cool ventilated design. Neck flap to keep your neck protected while looking through the eyepiece.

  • Set of 5 H-alpha optimized Eyepieces, 8mm up to 27mm


    5 pieces H-alpha optimized LUNT Eyepieces with 1.25" connection. Focal lengths of the Eyepieces is 8mm, 12mm, 16mm, 19mm, and 27mm.


Image of the Sun thourgh a Lunt 152mm H-alpha telescope

General description of 152mm Lunt Solar Telescopes

A 6” refractor for solar observing: 152 mm aperture, 900 mm focal length, 100% unobstructed, and a bandwidth of <0.65 Angstrom - the solar telescope for professionals!

If it is the perfect solar image you are after, than the LS152THa is the right system for you. It provides a large image size and high resolution. The system will perform to the highest level at any magnifications. Utilizing advanced hi-contrast coatings and the new air-pressure tuning system “Pressure Tuner”, the user will be able to experience crisp, sharp, high-magnification visual and digital images.

Certainly these high end telescopes are equipped with high end accessories. The alternatively with B1200, B1800 or B3400 blocking filter equipped telescopes will be delivered with tube rings, dovetail plate, zoom eyepiece 7.2 to 21.5 mm, transport case and Starlight Instruments Feather-Touch focuser.

Also available for the LS152THa is an additional Calcium-K module (LS152TCaKMD, article no. 0551590). This can easily replace the standard H-alpha module in a few steps, so you can observe and image the sun with only one telescope alternatively in H-alpha light or in the wavelength of Ca-K!

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 Kg18

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