The Lunt LS100MT is a telescope designed for observation of the Sun in H-Alpha light. The H-Alpha wavelength offers the most impressive way to observe the Sun, revealing prominences at the Sun’s edge, filaments and flares on the surface, and much more.
Double Stack: Thanks to the innovative Pressure Tuning system, the two Etalon filters achieve a half-width at half-maximum of less than 0.28 angstroms. A set of collimating lenses installed in the telescope ensures optimum performance.
Focusing is achieved via a sturdy 2-inch R&P focuser with a 1:10 reduction ratio. This focuser is ZWO EAF-compatible.
Night-time sky observation: The H-alpha Etalon system can be removed from the telescope in just a few simple steps. The 3-lens apochromatic refractor can then be used as a standard telescope for observation and photography of the night sky.
But this also expands the possibilities for solar observation: without the h-alpha filters, the telescope can be fitted with a white light filter or a Herschel prism to observe sunspots.
The FPL-53 triplet objective delivers an outstanding, colour-pure image. Standard 2-inch diagonal mirrors can be used with the high-quality R&P focuser.
PT pressure tuner: Fine-tuning on the Etalon filter is provided via an air pressure system. A small change to air pressure within a pressure chamber inside the telescope changes the refractive index of the air, resulting in precise yet effortless adjustment to the H-alpha spectral line. The pressure tuner guarantees a uniform image with no central obstructions and a long-lasting wear-resistant etalon.
The B1800 blocking filter is very well suited to visual solar observation but can also be utilised for solar photography using cameras with a small sensor chip or which use the APS-C format. For cameras with large sensors, a telescope with a larger blocking filter should be used so that the sensor will be illuminated. For solar photography, we generally recommend so-called planetary cameras which work smoothly with this blocking filter.
Illustration similar: Delivery without mount and tripod
It not only matters which telescope you buy but also where you buy it. Our additional services:
- We are a leading telescope dealer and know the devices we sell. Our customer service team will gladly help you after your purchase if you have problems with assembly or operation.
- We provide a copy of the 80-page Telescope ABC beginners handbook with every telescope.
Our expert comment:
Amongst Lunt telescopes, there are a number of versions with different features. The model which is on offer can be deduced from the label.
An important price-influencing feature is the blocking filter size. There are 4 different blocking filters, with diameters of 4mm, 6mm, 12mm and 18mm. These are known as the B400, B600, B1200 and B1800. Unless otherwise stated in its name, an OTA does not include a blocking filter.
CaK or Ha indicate whether the devices are optimised for blue calcium spectral lines or for red H-alpha spectral lines. Over 90% of devices on sale are H-alpha devices, designated with Ha.
C or FT are used to distinguish between two versions of focusers. C is for standard focusers. FT is an improved model produced by FeatherTouch.
PT denotes devices with air pressure fine-tuning. Filters without PT use tilting for fine-tuning. Generally, air pressure models provide a more homogenous image field.
DS or DS50 are the identifiers for double stack. These devices have 2 etalon filters. These create narrower bandwidths and improved contrast.
2 numbers separated by a slash can also be found in the name. The first number denotes the diameter of the front lens. The second number is the focal length. So, a 60/500 is a telescope with an aperture of 60mm and a focal length of 500mm. Lens diameter generally refers to the diameter of the provided etalon.
(Bernd Gährken)
