LUNT Ca-K module and conversion kit for LS130MT

Transforms the LS130MT into a Ca-K solar telescope and into a 3-lens ED Apo for observation & photography of moon, planets & deep-sky

  • Turns the LS130MT into a real all-round telescope
  • Provides Sun observation in the Ca-K line
  • Provides Sun observation in White-Light
  • Provides night sky observation
  • Only usable with LS130MT telescope

€3,498.00*

Currently not available
Expected to be available again from 24 Jul 2025.

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Product number: 0551695
EAN: 4007922062655
WEEE-Reg.-Nr.: DE 34323861

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Product information "LUNT Ca-K module and conversion kit for LS130MT"
The LS130MT/B3400 telescopes can be upgraded with this optional Ca-K module and conversion kit. This allows to explore the Sun at different wavelengths with one and the same telescope, and the telescope can also be used for observing and photographing the starry night sky.

You can replace the H-Alpha system of the LS130MT/B3400 telescope with this conversion kit with Ca-K module in just a few easy steps. This makes it possible to observe the Sun in H-alpha or in the light of the Calcium-K wavelength - with one and the same telescope!

This Ca-K module was specially designed for the LS130MT/B3400 H-Alpha telescope. It is delivered as a set together with the conversion kit with a completely new focuser. Simply loosen three knurled screws at the LS130MT/B3400, which hold the H-Alpha unit together with the focuser. Here the new focuser will be fixed with the Ca-K module, and you have already made your LS130MT a adequate Ca-K telescope.

But that's not all: With the new focuser, without the Ca-K module, the LS130MT/B3400 can also be used as a 3-lens apochromatic telescope for astronomical observations and photography at night!
Or you can observe the Sun in White-Light together with a LUNT Herschel wedge!
This conversion kit turns the LS130MT into a real all-round telescope!

This conversion kit can also be used at the LS130MT/B1200 and LS130MT/B1800 telescopes, but it is not necessary there. This conversion kit is only necessary at the LS130MT/B3400, because at this telescope the blocking filter is fix installed inside the focuser.

SCOPE OF DELIVERY
  • 2" Ca-K Module for LS130MT telescope
  • 2" focuser with 10:1 reduction and adapter to LS130MT telescope
  • Instruction manual
LS130MT telescope not included! Can only be used together with an LS130MT solar telescope.



Batteries required: No
Colour: black
Extended warranty (years): 5
Eyepiece Barrel Diameter (mm): 50.8
Field of application [Telescopes]: Deep Sky Observation , Deep Sky Photography , Lunar observation , Lunar photography , Planetary observation , Planetary photography , Solar observation
Focusing system: 2" Rack-and-Pinion Focuser with 10:1 reduction
Full width at half maximum (Angström), less then: 2.4
Material: Aluminium
Net Weight total (incl. accessories) (in kg): 2.6
Telescope filter type: Solar Filter CaK
Total height (mm): 210
Total length (mm): 310
Total width (mm): 170

Product and safety instructions


Manufacturer: 
Bresser GmbH, Gutenbergstraße 2, 46414 Rhede

Contact: 
www.bresser.de


Warning notes
  • Safety instructions: There are certain dangers when observing the sun, regardless of the telescope used. Lunt-Solar-Systems places great emphasis on the safety of their products during manufacture. Your safety is the highest priority, and we ask that you carefully read the telescope manual before beginning solar observation. Please never disassemble the telescope! Never use it if it has been modified or damaged in any way! Always contact our customer service if you have any questions regarding the safety of your instrument. Never look at the sun with an unprotected eye or with a telescope not intended for solar observation! Never leave your telescope unattended while it is pointed at the sun! Other people who are unfamiliar with it might attempt to replace the block filter with another prism, unaware of how critical this filter is for safety. The components of Lunt-Solar-Systems telescopes are not interchangeable with those of other manufacturers. Lunt-Solar-Systems solar telescopes contain several different optical elements that have been precisely adjusted and mounted during manufacture. These systems require no maintenance. Never disassemble the telescope. Doing so will void the warranty, potentially leading to expensive repairs, and may cause future damage to your instrument, compromising your safety! Most Lunt-Solar-Systems telescopes and filters include a very sensitive optical component called an Etalon. These Etalons are built into the system to protect them as best as possible. Countless considerations have been made to ensure the best performance of this "heart" of every system, even under the daily stresses it inevitably faces, such as shocks and vibrations during transport or regular use. Nevertheless, it should never be dropped. Improper use of the telescope can damage the Etalon (not a warranty case) and render the system unusable until repaired. The instrument should always be stored in its original packaging or in the optional transport case (item number 0554010). Like any optical precision instrument, it should be stored in a dry environment. With proper care, you will enjoy your instrument for a lifetime!

Accessories

€50 Gift Card
BRESSER Gift Voucher worth 50€  Every year, birthdays, anniversaries, Christmas, and other special occasions come around relentlessly. And with them, the same question arises: How can we bring joy to our loved ones on these special occasions? Send men, women, and children on unique journeys of discovery with a BRESSER voucher.  Give the gift of foresight – the BRESSER voucher worth 50 euros  A gift only brings joy to both sides if it suits the recipient. This is how you can tell that a BRESSER gift voucher is guaranteed to be received with a joyful smile: Do one or more of the following statements apply?  The recipient … … gazes through the telescope at the sky on every clear night. … always takes a soil sample on vacation, which is then examined under the microscope at the hotel. … loves exploring nature with open eyes while hiking, camping, or hunting. … passionately runs their own photo studio. … never misses the weather forecast. … is enthusiastic about innovative technology and new gadgets. … is open to everything and always strives to expand their horizons. A match? Then you’ve found the perfect gift with a BRESSER voucher. Whether an absolute beginner or a passionate professional, the diverse products in the fields of astronomy, microscopy, sport optics, photo studio, weather & time, and electronics allow your loved ones to gain wonderful insights into fascinating worlds. And it’s not just for the grown-up explorers: Surprise children with a BRESSER voucher, enabling them to engage with science in a playful and age-appropriate way.  How to get the 50-euro BRESSER voucher Would you like to open up new perspectives for a loved one? It couldn't be easier: Choose one of the beautiful voucher designs. Astronomy, microscopy, electronics, etc. – there’s a great look for every area of interest. Important: No matter which design you choose, every gift voucher can, of course, be redeemed throughout the entire shop at bresser.de. Enter your name and the name of the recipient. You can then write a message of up to 300 characters to make your voucher a truly personal gift. Now just add it to your shopping cart and complete the payment. Once the order process is complete, the gift voucher is sent as a PDF directly to your email inbox. From there, you can send it digitally from afar or print it out and present it in person.  Give the gift of a broader perspective – with the BRESSER 50-euro voucher for women, men, and children. 

€50.00*
LUNT LS2HW 50.8mm (2'') Herschel-wedge
Herschel-wedge / Solar-wedge for superior White-Light solar observing and imaging. For refractor-telescopes up to 150mm aperture, and with 2'' focuser. Complete system with installed ND3.0 filter.Herschel-Wedges will be used to observe the sun in White-Light. Around 95 % of the sun light will be suppressed by the Herschel Wedge. The remaining sun light will be dimmed by a fix installed ND3.0 grey filter. Lunt Solar Systems Herschel-wedges are installed in a fully closed housing with integrated heat trap. There is no stray light escaping, therefore it is very safe.The difference between Herschel-wedges and normal front mounted filters is, that the filtering takes place just before the eyepiece or camera. This will provide a better contrast and sharpness of the solar image.Furthermore, there is more safety at a Herschel-wedge than at a front mounted filter. A Herschel-wedge can not rip or become holes like a foil. And also it can not drop down from the telescope objective accidentally.Only for use with refractor telescopes up to 150mm aperture:Because the full energy and heat of the sun will be inside the telescope, we advise to use only refractors with a Herschel-wedge. The refractor must not have corrector lenses at the back. Optical elements like corrector lenses, or secondary mirrors of reflector telescopes, become very hot by the concentrated solar energy and could be damaged.Tuning the brightness:Because the Herschel-wedge produce polarized light, you can use a normal polarizing filter at the eyepiece or camera-adapter. By turning the polarizing filter the brightness will be reduced.Polarizing filter not included. We recommend the BRESSER 2'' polarizing filter 4946465.FEATURESFor refractor-telescopes up to 150mm apertureConnection to telescope: 2''Connection to eyepiece: 2''90° housing like star-diagonalEspecially high-quality optical surfaces for very good contrastFully closed housing with integrated heat trapNo stray light escaping - therefore it is very safeThe needed ND3.0 filter is fix installedSCOPE OF DELIVERYHerschel-wedge for 2'' focuserIntegrated ND3.0 filterHardcaseInstruction manual

€598.00*
LUNT LS1.25HW 31.7mm (1.25'') Herschel Wedge
This Herschel wedge is designed for superior White-Light solar observing and imaging. It can be used with refracting telescopes up to 102mm aperture, with 1.25'' focuser. This complete system comes with installed ND3.0 filter.Herschel Wedges are used to observe the sun in White Light. Around 95% of the Sun's light is suppressed by the wedge's ceramic prism. The remaining sun light is dimmed further by a factory-installed ND3.0 grey filter. Lunt Solar Systems Herschel wedges are installed in a fully closed housing with integrated heat trap. No stray light can escape from this, therefore it is very safe method of observing our nearest star.The difference between Herschel-wedges and normal front mounted filters is that the filtering takes place just before the eyepiece or camera. This provides better contrast and sharpness of the solar image - with more surface detail visible as a result.  Furthermore, a Herschel wedge is inherently safer than at a front mounted filter. A Herschel wedge can not rip or become punctured like a foil filter can be and it cannot become detached from the telescope objective accidentally.Only for use with refractor telescopes up to 102mm aperture:Because the full energy and heat of the sun inside the telescope, we advise solely using refractors for Herschel-wedge use. The refractor must not have corrector lenses at the back. Optical elements like corrector lenses, or secondary mirrors of reflecting telescopes, could suffer from thermal build-up by concentrated solar energy and could be permanently damaged.Tuning the brightness:Because the Herschel-wedge produces polarised light, you can use a normal polarising filter at the eyepiece, or camera-adapter. By turning the polarising filter the image brightness can be varied to the user's liking.This additional Polarising filter is not included. We recommend the BRESSER 1.25'' polarising filter, no: 4946464.FEATURESFor refractor telescopes up to 102mm apertureConnection to telescope: 1.25''Connection to eyepiece: 1.25''90° housing like star-diagonalEspecially high-quality optical surfaces for very good contrastFully closed housing with integrated heat trapNo stray light escaping - therefore it is very safeThe needed ND3.0 filter is fix installedWHAT'S INCLUDEDHerschel-wedge for 1.25'' focuserIntegrated ND3.0 filterTransport caseInstruction manual

€229.00*
LUNT CAA-RF 0.8x reducer/field-flattener for nighttime photography with LS80MT, LS100MT & LS130MT telescopes
​Field-flattener and focal length reducer for deep-sky astrophotography. Designed for the multipurpose APO telescopes of the Lunt-Solar-Systems LS80MT, LS100MT and LS130MT series.At the telescopes of the MT series from Lunt Solar Systems, the H-Alpha filter unit for solar observation can be removed, then these telescopes can be used as high quality ED APO's for observing and photographing the night sky.This accessory for the LS80MT, LS100MT and LS130MT telescopes shortens the focal length by a factor of 0.8x, providing a larger field of view for deep-sky astrophotography. This also allows shorter exposure times. At the same time, the field of view is flattened for photography.On the camera side, the reducer/field-flattener has a T2 male thread (M42x0.75). DSLR cameras can be connected here directly with a normal T2 ring.For other cameras, an M48x0.75 male thread is available in addition to the T2 male thread. The distance between reducer/field-flattener and camera sensor should be around 50 to 55mm.An M64x1 thread is provided on the telescope side. This allows to connect the reducer/field flattener to the focusers of the conversion kits for the LS80MT, LS100MT and LS130MT telescopes. Please note that for using the reducer/field flattener at the LS80MT, LS100MT or LS130MT telescopes, the corresponding conversion kit for night-time use of the telescope is absolutely necessary..FEATURESShortens focal length of F/7 ED telescopes by a factor of 0.8xFlattened field of view for photographyT2 thread and M48x0.75 thread for camera connectionWorking distance 50 to 55mmSCOPE OF DELIVERY0.8x reducer/field-flattenerAdapter to T2 thread (M42x0.75) and to M48x0.75

€598.00*

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LUNT B3400 Blocking-Filter in 2 inch extension tube
Blocking-filter in straight extension tube, for telescopes up to 3060mm focal length. Can only be used together with a LUNT H-alpha filter, or with a LUNT H-alpha telescope!Lunt Solar Systems offers blocking-filters in different sizes, and alternatively in 90° star-diagonal housings or straight extension tubes. You can choose what blocking-filter you will use at your LUNT H-alpha Etalon system.The B3400 is installed in a straight extension tube, for 2 inch (50.8mm) focuser on the telescope side, and with 2 inch eyepiece connection and 1.25 inch (31.7mm) adapter on the eyepiece side. The B3400 can be used at LUNT H-alpha systems, if the used telescope has up to 3060mm focal length.The blocking-filter can not be used without additional H-alpha filter system from Lunt Solar Systems! Blocking-filters are absolutely required for the safety and performance of H-alpha telescopes for solar observing. Lunt Solar Systems blocking-filters contain a unique filter system. We can only warranty safety or performance, if blocking-filter is paired with a H-alpha filter or H-alpha telescope of Lunt Solar Systems.At the tab "Accessories" you will find H-Alpha telescopes and filters with which this blocking filter can be combined.FEATURESBlocking-filter only usable at additional H-alpha filter systemFilter diameter: 34mmUsable at telescopes up to 3060mm focalIn straight extension tubeFor 2 inch focuserConnection for 2 inch eyepiecesAdapter for 1.25 inch eyepiecesSCOPE OF DELIVERYBlocking-filter B3400 in 2 inch straight extension tubeAdapter for 1.25 inch eyepieces

€3,498.00*
LUNT Ca-K filter-module for LS130MT
This Ca-K module can be used at the LS130MT/B1200 and LS130MT/B1800 telescopes to observe the Sun also in the Calcium-K line. At the LS130MT/B3400 additionally the conversion kit for the LS130MT is required (item number 0551696).You can use this Ca-K module with your LS130MT telescope to observe and photograph the Sun not only in H-alpha, but also in the blue calcium-K wavelength. Here again completely different phenomena become visible on the Sun than in H-alpha.This Ca-K module was specially designed for the LS130MT H-Alpha telescope. If the H-alpha Etalon unit is removed from the LS130MT, the Ca-K module is simply inserted into the focuser instead of the blocking-filter.The additional conversion kit 0551696 is necessary at the LS130MT/B3400, because at this telescope the blocking filter is fix installed inside the focuser.For human eyes, the calcium-K light is just at the limit of the visible range. Many people have problems with visual observation. However, this does not apply to photography, where the Ca-K module shows everything the Sun has to offer in this wavelength.SCOPE OF DELIVERY2'' Ca-K Module for LS130MT telescopeInstruction manualLS130MT telescope and conversion kit not included! Can only be used together with an LS130MT solar telescope, at LS130MT/B3400 additional conversion kit 0551696 necessary.This Ca-K module is also available for the LS130MT/B3400 as a set together with the required conversion kit (item number 0551695).

€2,798.00*
LUNT LS130MT/B1800R&P Multipurpose APO Telescope for Sun + Night-Sky
Modular designed multipurpose telescope, both for observing the sun in the H-alpha wavelength, as well as for night sky observations. Easy conversion between the different applications with a few simple steps. 3-lens apochromatic telescope with FPL-51 glass, 130mm aperture and 910mm focal length - excellent image quality for H-Alpha solar observation and also for observing the starry sky at night. With innovative air pressure tuning system, good 2 inch (50.8mm) R&P focuser, and B1800 blocking filter. Solar observing in H-alpha: The LS130MT/B1800 is a complete telescope for observing the sun in H-alpha light, with 130mm free aperture (no central obstruction) and 910mm focal length. The H-alpha wavelength is the most impressive way to observe the sun, showing protuberances at the sun's edge, filaments and flares on the surface, and much more. An internal Etalon filter achieves a bandwidth of <0.7 Angstrom with the innovative air pressure tuning system Pressure-Tuner. Tuning is done by slightly changing the air pressure in a pressure chamber inside the telescope. This changes the refractive index of the air, making it easy to tune to the H-alpha line. The pressure tuner guarantees a homogeneous image, without central obstruction, and a permanently protected Etalon without erosion. A set of collimating lenses installed in the telescope ensures best performance. Fine adjustment is achieved with a solid 2 inch R&P focuser with 10:1 reduction. Blocking-filter is the B1800. The B1800 is good for visual solar observing and also solar imaging is possible by cameras with small to large sensor chips. We recommend a LS130MT with B3400 blocking-filter by using cameras with very large sized sensor chips. The star diagonal in which the blocking filter is installed, is equipped as standard for 1.25 inch eyepieces and with a T2 camera connection. Observing the starry night sky: The H-Alpha Etalon system can be removed from the telescope in a few easy steps thanks to its modular design. Then the 3-lens apochromatic refractor can be used as a normal telescope with 130mm aperture and 910mm focal length for observation and photography of the night sky. The FPL-51 triplet lens offers an outstandingly low colour aberration image. Common 2 inch star diagonals can be used at the R&P focuser of the telescope. Please note that the optionally available conversion kit 0551696 is only absolutely necessary for the LS130MT version with B3400 blocking filter if the telescope is also to be used at night. The conversion kit is not required for the versions with B1200 and B1800. More applications: With additionally available accessories the LS130MT offers even more possibilities! - Double-Stack The LS130MT telescope can optionally be upgraded with the additionally available double-stack module LS130MT/DSII (item number 0551690). The DSII system is a internal double-stack module with Pressure-Tuner. Thereby a bandwidth of <0.5 Angstrom is achieved for H-alpha solar observation. Therefore much more details on the solar surface will become visible. - Solar observing in White-Light If the H-alpha unit has been removed, of course either a sun filter can be installed in front of the objective, or a Herschel-wedge at the focuser can be used to observe the sunspots in White-Light. - Solar observing in Ca-K wavelengthThe additionally available "LUNT Ca-K Filter Module for LS130MT" (item number 0551697) can be used on the LS130MT to observe and photograph super-granulation and other effects visible at this wavelength on the sun. This makes the LS130MT a completely universal usable apochromatic telescope of highest quality! FEATURES 3-lens APO refractor, FPL-51 Aperture: 130mm (no central obstruction) Focal length: 910mm Bandwidth: internal Etalon with <0.7 Angstrom Tuning: air pressure tuning system Pressure-Tuner Blocking filter: B1800 with 1.25" and T2 connection Focuser: R&P with 10:1 reduction Two tube-ring with handle Sol-Searcher installed inside handle Dovetail bar at GP-level for astronomical mounts Weight: 12.1kg Length with blocking filter and dew-shield: 100cm Length without blocking filter and removed dew-shield: 80cm SCOPE OF DELIVERY LS130MT Multipurpose Telescope Pressure-TunerB1800 blocking filter in star-diagonal housingTube extension for using without H-alpha Etalon 2 inch R&P focuser with 10:1 reduction Tube rings with dovetail bar Transport case (92 x 42 x 35 cm) Instruction manual

€13,690.00*
LUNT LS230THaDS/B3400 H-alpha solar telescope
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