LUNT LS100FHa/B1800d2 H-alpha solar filter

100mm H-alpha double-stack solar filter, for all LS100FHa filter-systems and LS100THa telescopes.This double-stack Etalon is compatible to all Lunt Solar Systems LS100FHa filter-systems.Also the LS100THa H-alpha solar telescopes can be very easily double-stacked by using this 100mm double-stack filter. This combination offers high quality double-stacking to the observer.Adding this additional double-stack Etalon system will reduce the bandwidth to ~<0.55 Angstrom. So you will have much more contrast and more details on the sun will be visible.Please note: The LS100FHa double-stack filter is only compatible with the old LS100THa H-alpha telescopes, but not with the new LS100MT multipurpose telescopes!Without blocking filter! Only for use as double-stack filter, or together with a additional available blocking filter. If the filter is used only single stacked together with a optional blocking filter, then the bandwidth is <0.7 Angstrom.FEATURESAperture: 100 mmBandwidth double stacked: <0.55 AngstromTuning: tiltable EtalonHousing diameter: 162 mmLength: 101 mmWeight: 2.75 kgFront thread: M120x1.5 female threadRear thread: M120x1.5 male threadSCOPE OF DELIVERYLS100FHa solar filterTransport caseInstruction manual

​​BRESSER Solar Filter 92,7 mm for Messier AR-90 Telescopes Category: Spare Part for Messier Telescope Series Description: The high-quality Solar Filter with a diameter of 92,7 mm is ideal for safe solar observations with telescopes. It is suitable for the BRESSER Messier AR-90 Telescopes 4890500 AR90s, 4890900 AR90/900, 4890120 AR90L. Please check compatibility using the product number on your optical instrument.

With the usage of barlow lenses, you can extend the equivalent focal length of telescopes and hence increase the magnification of your observed targets. Subsequently, you can use lower power eyepieces in Barlows to act as much more powerful eyepieces, but retain the larger ocular size and more comfortable viewing that comes with lower power eyepiece designs.Due to their two lens design, these Barlow lenses provide a brilliant image quality for the whole visual field and are suitable for observations and photography.  The black coloured Barlow element cell in this BRESSER Barlow Lens 2x 31.8mm/1.25," can be unscrewed and has the same thread as 1.25" filters, allowing it to be mounted in 1.25" eyepieces, t-adapters and other accessories, giving you flexibility of use and the ability to vary magnification in different accessories.  For instance, the black Barlow cell screwed into the average length nosepiece of a standard push fit t-adapter will give around 1.6x magnification on an attached DSLR.  This can be very useful when trying to get to photographic focus with some Newtonians and Solar Telescopes, which lack the necessary amount of in focus travel to get a camera to a prime focus position.FEATURESsuitable for observations and photographydoubling of the focal lengthtwo lens designfully multi-coatedWHAT'S INCLUDEDBarlow lens (1pc)

60mm H-alpha double-stack solar filter, for all LS60FHa filter-systems and LS60THa/LS60MT telescopes.This double-stack Etalon is compatible to all Lunt Solar Systems LS60FHa filter-systems and LS60THa / LS60MT telescopes. Adding this additional double-stack Etalon system will reduce the bandwidth to ~<0.55 Angstrom (dependent upon used telescope). So you will have much more contrast and more details on the sun will be visible.Without blocking filter! Only for use as double-stack filter, or together with a additional available blocking filter. If the filter is used only single stacked together with a optional blocking filter, then the bandwidth is <0.75 Angstrom.FEATURESAperture: 60 mmNo central obstructionBandwidth double stacked: <0,55 AngstromTuning: tiltable EtalonHousing diameter: 95 mmLength: 85 mmWeight: 0.85 kgFront thread: M90x1 female threadRear thread: M90x1 male threadSCOPE OF DELIVERYLS60FHa solar filterTransport caseInstruction manual

100mm H-alpha solar filter system with B3400 blocking filter, for front mounting at telescopes with 2" focuser, and up to 3060mm focal length.The LS100FHa H-alpha Etalon filter system with 100mm aperture for use on any refractor and many other telescopes. Because the LS100FHa has an estimated bandwidth of <0.7 Angstrom it is capable to providing high contrast views of both solar surface and edge detail (prominences).The system includes the B3400 blocking filter, which is usable for telescopes up to 3060mm focal length. The blocking filter is installed in a straight extension tube for 2" focuser. This extension tube is equipped with a reception for 2" eyepieces and a adapter for 1.25" eyepieces.Adding an additional available double-stack Etalon system will reduce the bandwidth to ~<0.5 Angstrom.FEATURESAperture: 100 mmBandwidth: <0.7 AngstromTuning: tiltable EtalonHousing diameter: 162 mmLength: 101 mmWeight: 2.75 kgFront thread: M120x1.5 female threadRear thread: M120x1.5 male threadBlocking filter: B3400 in extension tube for 2" focuserMaximum focal length of telescope: 3060 mmSCOPE OF DELIVERYLS100FHa solar filterB3400 Blocking Filter (for 2" focuser) in extension tubeTransport caseInstruction manual

NEW - now including a high-quality aperture Solar-filter for safe observation of sunspots, eclipses and planet transits. Great telescope for night and solar observation.The BRESSER Messier 8'' dobsonian is simply a breakthrough. Despite of its low price this telesccope offers a versatility and quality rivaling a lot more expensive telecopes. The optical diameter of 203mm (8'') does not restrict your observations on solar system objects like the moon or the planets - you can reach farther into the sky and explore globular and open clusters, nebulae and galaxies. With that telescope those objects are beginning to show structures: globular clusters are no longer only fuzzy blobs, but are resolved into masses of individual stars. Nebulae, that can only be barely detected in smaller scopes, reveal structures within. The telescope is setting a new standard in versatility: the excellent Hexafoc focuser boosts a free diameter of 65mm (2,5'') so that you do not have vignetting in big widefield eyepieces that is caused by smaller focuser barrels. The big altitude wheels handle those big, heavy eyepieces without problems - and when you intend to load even more (like a binocular viewer with two eyepieces) then you can move the tube in its tube rings and achieve balance within seconds. The excellent rigidity of the focuser makes focusing a snap - even for astrophotography. This is another virtue of this highly versatile telescope system: you can remove the altitude wheels from the tube rings, attach a dovetail and use the optical tube on a equatorial mount for astrophotography - in minutes. The focuser is handling even heavy cameras tilt and shifting-free. You are extremely demanding in your image sharpness? No problem - with the optional 10:1 gear reduction sharp images are easy. If you consider, that the focuser is that part of the telescope that is used most often, you will recognize the quantum leap this Hexafoc represents in a telescope of this price range. With the included standard accessories (6x30 finder and 25mm SPL-eyepiece) the telescope is ready for observing. If you need to transport or store the telescope as compact as possible you will like this: the rocker box of the 8'' BRESSER Messier assembles and disassembles extremely easy and fast due to the use of metal standard furniture fasteners. So you can transform the bulky rocker box into a handy flat package of boards. This telescope is setting a new standard in usability, versatility and performance in its price class.Please note: Reflector telescopes with optical design Newton are very good for astronomical observing at the starry night sky. But these telescopes are not well usable for observing landscape and nature during daylight. Therefore we suggest BRESSER refractor (lens) telescopes for landscape and nature observing. FEATURES Optical design: reflector telescopeMirror diameter: 203 mm / focal length: 1218 mm / F/6Maximum recommended magnification: 406x telescope for night and solar observation high quality BRESSER Newton optics parabolic primary mirror primary mirror diameter: 203 mm focal length: 1218 mm 2,5'' HEXAFOC focus primary mirror out of special-purpose glass with little thermal expansion shifting-free focusing, even with heavy accessories easy to move the tube dismountable rocker box optics can be attached to other mountings differently sized adjusting- and lock-screws SCOPE OF DELIVERY newtonian reflector aperture solar-filter 6x30 viewfinder 25mm SuperPloessl eyepiece (Ø 31,7 mm / 1,25'') 1 extension shell 37,5mm for 2.5'' Hexafoc 1 eyepiece adapter Ø 31,7 to 50,8 mm 2 tube clamps 2 altitude wheels 1 rockerbox with 2 ground boards and assembly material Dimension of shipping box No.1: 125x38x41cm - 15.0kg Dimension of shipping box No.2: 54x54x22cm - 13.5kg

Ultra Light Dobsonian 500mm GENERATION II - telescope mechanics handcrafted in HUNGARY and GERMANY No telescope type has influenced amateur astronomy as radically as the dobsonian telescope. Before the introduction of this telescope type by John Dobson the vast majority of amateur telescopes were small inadequate refractors on shaky mounts - just good enough to show the polar regions on mars or the rings of Saturn. Bigger telescopes, like the Schmidt-Cassegrain telescopes, were restricted to the relatively small group of amateurs that could afford them.The brilliant combination of simple - but effective - mechanics and the largest aperture available led to a worldwide triumph of this concept. No other telescope type offers you so much light for your money as a good dobson. We have taken the motto held together by gravity and driven by yoghurt power and offer a modern version of the classic - designed by amateur astronomers for amateur astronomers. Despite its large aperture the telescope can be transported easily even in small cars and is assembled within minutes without tools. The construction was optimized for maximum rigidity with a minimum of mass. The combination of big altitude wheels and a optimized aluminium-sandwich construction allows for small movements even at high magnifications. The focus position is already positioned to accept our coma-corrector (part No. 0510330) . The ideal workhorse for the deep-sky enthusiast. A telescope with 500mm aperture gathers more than 5100-times more light than the naked eye. Details on planetary surfaces stand out even to unexperienced observers, and countless deep-sky objects show details and some color. Bright globular clusters are resolved down to the core and the view of the lunar terminator will provide a unforgettable experience. The fast 20’’ f3.6 main mirror as well as the large 120mm secondary mirror are made of high quality quartz material, so the cooling time is reduced to a minimum and the Dobson is quickly ready for use. Every main mirror is delivered with an individual optical test certificate, which guarantees the highest capacity. A laser engraved center mark of the main mirror allows easy adjustment. The optical surface has a high-quality aluminum silvering with 94% reflectivity and an extremely resistant quartz protection layer. The mirror overcomes frequently occurring dew fogging and cleanups without any damages and guarantees a long service life. A complete redesign of this Dobson was necessary to ensure the significantly increased requirements to stiffness and load bearing capacity of the optical components. All connections of the tube structure were made in the TIG welding process and no rivets and screws were used. This has made it possible for us to produce this 20’’ light weight Dobson so unbelievably stiff in spite of the low weight - a noticeably good quality which is searching for its match. The production of almost all mechanical components is carried out by our partners in Hungary and the final assembly of the optics and subsequent quality control takes place in Rhede, Germany. The equipment details of the smaller Dobson models, which have been popular for years, have been taken over and even extended considerably. First of all, of course, the very good decomposability and transportability should be mentioned. Set-up and dismantling can be carried out without tools. The main and secondary mirrors are adjustable during the observation and only two adjusting screws have to be moved. Thanks to the use of precision ball-heads in the main mirror cell and a precision hinge for secondary mirror suppport, the adjustment is absolutely easy and guarantees excellent stability. All connecting parts of the tube trusses now consist of CNC machined aluminum and are attached by stainless steel dowel screws. The secondary mirror can now also be adjusted by the adjusting screws in the direction of the optical axis. The tried and tested 2.5’’ HEXAFOC focuser with 1:10 fine adjustment has been used for years - this allows vignetting-free observation despite the fast aperture ratio. A second 40° displaced installed mounting plate with a viewfinder shoe allows the rotation of the tube top in combination with a favorable position of the viewfinder tube or the mounting of an additional TELRAD viewfinder. The 6 supporting feet underneath the rockerbox offer a perfect stability and guarantee a smooth tracking in azimuth. Four smaller fans are installed in the side of the mirror box as well as a large fan is installed under the main mirror. This allows an even quicker adaptation to the ambient temperature and reduces the tube seeing (boundary layer removal). The lateral altitude wheels can now be stowed comfortably in the foam layers of the mirror box. Last but not least another gimmick: The optical tube and the mirror cell are designed to use also on heavy equatorial mounts. Dimensions for mobile use: DIMS total: 680x680x1790mm; Rockerbox 678mmx678mmx347mm; Mirrorbox 590mmx590mmx361mm; Trusses approx. 1084mm; Truss diameter: 25mm; Eyepiece height while pointing at zenith approximately 1,63m; 20’’ Total net weight: 53 kg; 20’’ Mirror Box + Altitude wheels: 35,8kg; 20’’ Secondary Cage: 3,8kg; Rockerbox: 10,6 kg; 20’’ 4 Truss pairs: 2,8kg; 20’’ Primary mirror: 20kg SPECIFICATIONS Truss-Dobsonian telescope in full Aluminium construction Handcrafted in HUNGARY and GERMANY Fast 20’’ f3.6 optics with 1800mm focal length Large 120mm secondary mirror (short axis) Quarz primary- and secondary mirror set Laser engraved central mark on primary mirror Eyepiece height while pointing at zenith approximately 1,63m Full welded rigid telescope structure - no rivets and no screws Telescope tube and rockerbox powder-coated Collimation while observing with the delivered tooling DeLuxe 2,5’’ HEXAFOC focuser with 1:10 gear-reduction 8x50 finder scope with red illuminated reticle Slider bearings made from TEFLON und GRP for smooth and precise movement Improved primary mirror cell with completely redesigned mechanics High precision hinge system for secondary mirror holder Secondary mirror holder with adjustment mechnism along the optical axis 6 larger feet to improve stability Counter-weights (4 x 1.0 kg) included 2 universal finder slots to enable an easy finder position Quick-lock fasteners with new springloaded design for comfortable use Large powder-coated yellow altitude wheels for smooth tracking Altitude wheels can be stored in the mirror box 5 cooling fans are speeding up the cool-down time SCOPE OF DELIVERY Truss Dobsonian Telescope Individual optical test report for primary mirror 8x50 finder with red illuminated reticle Stray light shield for secondary cage Primary mirror collimation tool Battery compartment with bag for fans Extension tube for focuser Reducer 2’’/1.25’’ Manual SHIPPING DIMENSION - truck shipment only in order to guarantee a save transport: BOX1: 600x600x380 approx. 44 kg ; BOX2: 690x690x330 approx. 17 kg ; BOX3: 150x150x1150 approx. 4 kg