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


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SKU: 15891 Category:


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please note that there is NO blocking filter with this telescope. To ensure a completely safe use of that telescope, you need to add an optional filter. You may either choose an upright filter for astrophotography (like model 15928.) Or a visual filter in a diagonal such as 15936 for example. Please note that the filter has to be chosen in accordance to the telescope you have! You have to choose it according to the focal length of the telescope.

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

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 famous Starlight instruments FeatherTouch focuser allows extremely precise focusing

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

Product number: 15891


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