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Lunt Solar Systems Solar telescope Lunt ST 100/800 LS100T Ha B3400 FT PT OTA


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Lunt Solar System H-alpha telescope:

This complete solar telescope is a high-quality achromat, with the front lens reducing stray light to half that of a standard achromatic objective. This eliminates possible coma, astigmatism, centering deviations and, together with the appropriate collimation lenses, makes a spherically-corrected flat-field solar telescope. The image is optimized for maximum sharpness in the red part of the spectrum. The optical system is shadow-free (no central obstruction) and is suitable for observing the Sun’s surface, as well as for prominences. The tube is made of metal and has been painted white.

Filtering is via an Etalon system: 2 parallel plates made of transparent material, e.g. silica glass with a mirrored surface. Such a system has frequency-dependent, periodic transmission maxima and loss minima. The Etalon filter used by the Lunt Solar System telescope isolates a specific wavelength of the solar spectrum: the H-alpha line. The internal Etalon system with fine tuning allows observing over a better than 0.7 Angstrom bandwidth. With an additional double-stack Etalon filter, which can be mounted in front of the front lens of the telescope, a bandwith of less than 0.5 angstrom is achieved.

The fine tuning of the etalon filter is via a newly developed air system. By increasing the air pressure inside the filter bandwidth can be precisely adjusted to 656.28 nm to observe even the finest details: Enjoy three-dimensional filaments in high contrast.

Fine adjustment is achieved with a Crayford style focuser or feather touch focuser with 10:1 reduction standard. An internal etalon with tune adjustment allows for a <0.8 Angstrom bandpass.

LS100T series solar telescopes come with one of the following blocking filters, depending on the package version (see what is included in delivery): B1200 (12mm), B1800 (18mm), B3400 (34mm), or without a blocking filter. Please note that using the telescope without a blocking filter is not possible and is extremely dangerous! The telescope has 100mm aperture and 800mm focal length, giving an image of the Sun with a diameter of around 7.3mm.

Telescope features:

  • 100mm aperture
  • 800mm focal length
  • < 0.7 Angstrom peak width at half-height with internal Etalon filter
  • 121mm OTA diameter
  • 634mm OTA length with blocking filter
  • weight 5 kg

Included in delivery:

  • OTA
  • appropriate tube ring clamps
  • dovetail rail for attaching to standard mounts
  • TeleVue Sol-Searcher
  • aluminum carrying case with key and form-fitting foam insert
  • Starlight Instruments 2 “Feather Touch Focuser with 1:10 reduction
  • B3400 blocking filter with 34mm aperture

It is not only important which telescope you buy, but also where you buy it.

We provide extra help:

  • We are a leading telescope dealer and know these instruments like the back of our hands.
  • We are always very happy to offer our assistance after your purchase, should you encounter any problems with your telescope’s setup or operation.
  • Our ‘Telescope Basics’ booklet – an 80-page beginner’s guide for our telescopes – is provided free of charge with every telescope we sell.

Our expert comment:

At Lunt telescopes, there are a number of variants with different options. It is possible to find out which model is being offered by looking at the designation.

An important criterion, also reflected in the price, is the size of the blocking filter. There are 3 different blocking filter sizes: 6mm, 12mm and 18mm in diameter. The designations for these are B600, B1200 and B1800 respectively. If there is nothing in the title, then it is an OTA without a blocking filter!

CaK or Ha mean that the instrument has been optimized for the blue calcium line or the red H-alpha line. Over 90% of instruments sold are H-alpha instruments, with the designation Ha.

C or FT refer to the two different focuser versions. C means the standard focuser and FT means an improved model from FeatherTouch.

PT is the designation for instruments with fine tuning that uses air pressure. Non-PT filters have fine tuning that works by tilting. The air pressure version usually provides a somewhat more homogeneous field.

DS or DS50 is the term for a ‘double stack’. These instruments have two Etalon filters. This achieves a tighter bandwidth and therefore better contrast.

In addition, you can find 2 numbers in the title separated by a slash. The first number indicates the diameter of the front lens. The second number is the focal length. So a 60/500 telescope would have a 60mm aperture and a focal length of 500mm. The lens diameter is usually also the diameter of the Etalon supplied.

The LS100T HA with built-in blocking filter and carrying case

The famous Starlight instruments FeatherTouch focuser allows extremely precise focusing

A suitable blocking filter is essential for the operation of a solar telescope.

An extended solar flare region – taken with an LS100T Ha.

Product number: 15903


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