LUNT LS50THa/B400PT H-alpha solar telescope (Refurbished)

Fast 70mm high-performance astrograph F5.5 designed for demanding astrophotographers and observers, featuring 5 lens elements in 5 groups With its sophisticated optical design incorporating five lens elements in five groups (Quintuplet), including two SD (Super ED) lenses and one ED (Extra-low Dispersion) lens, this astrograph delivers a virtually aberration-free optical system. The convex lens utilises two SD lenses and a high-refractive ED lens, while the front lens is crafted from a newly developed high-performance lanthanum glass. Perfect for astrophotography and visual observation This revolutionary astrograph is compatible with digital full-frame DSLRs and even larger 44 x 33 mm cameras. With its fast F5.5 aperture ratio, the 70mm astrograph produces exceptionally sharp, high-contrast, pinpoint stars from the centre to the very edges of the field of view. Not only is it ideal for astrophotography, but it also excels in visual observation, offering a wide field of view for deep-sky objects and delivering stunning detail in planetary observation with high magnification. Consistently sharp imaging across the entire field The VSD70ss is designed with a long peak range in focus adjustment accuracy, making it easier for astrophotographers to achieve consistently outstanding results. Even if the focus isn’t set perfectly, stars remain round and sharp across the entire image field. The VSD70ss is very temperature-resistant so that you always keep a very stable focus point. Minimal vignetting for uniform illuminationMost astrographs experience some level of optical vignetting (light gradually diminishes towards the image edges). This is mainly caused by the rear lenses being shadowed by the front lenses. As a result, photographers often need to apply image corrections or capture additional flat frames beforehand. The VSD70ss tackles this issue with large-aperture lenses in the rear elements and preserves over 90% of the light all the way to the edge of its 55mm image circle. The result is uniform brightness across the entire field, eliminating the need for extensive post-processing to compensate for edge darkening. The VSD70ss features cutting-edge multi-coatings with exceptionally high reflectivity. These coatings have been specially designed to optimise the performance of each individual lens element, ensuring maximum contrast and light transmission without degradation across multiple lenses. Note: *Mechanical vignetting may still occur depending on the camera system used, particularly due to the camera body or incorrect adapters. 96.7% Strehl for stunning visual observations When paired with a wide-angle eyepiece with low magnification the VSD70ss offers a flattened large field of view. Even with a high-quality wide-field eyepiece with a large field of view, stars appear sharp across the entire field of view during visual observation. At the centre of the field, the telescope achieves an impressive 96.7% Strehl intensity at visible wavelengths—surpassing even the acclaimed SD81SII apochromat with its 95.7% Strehl ratio. This superior optical quality is also evident when observing the Moon and planets at high magnifications. Large, versatile, and stable focuser The VSD70ss has a large focuser with a diameter of 87.5mm to make optimum use of the large 55mm field of illumination. Designed to support a wide range of accessories, this large focuser is perfect for astrophotography, accommodating everything up to large-format cameras or 35mm full-frame DSLR cameras. Its precision manufacturing ensures excellent stability, preventing any tilting even when using heavy imaging equipment. Optional VSD reducer for even faster resultsThe new reducer has been specially developed for the VSD90ss and the VSD70ss. At a focal ratio of 1:3.9. the photographer gets even faster results in astrophotography. Compatible with motorised focusersTo enable sensitive focusing, an optional dual-speed motor focuser is available for the VSD70ss. Additionally, an EAF (Electronic Automatic Focuser) from ZWO or a compatible system can be retrofitted. FEATURES SD apochromat, 5-element/5-group, AS coating Aperture: 70mm Focal length: 385mm (F/5.5) Resolution: 1.66 Limiting magnification: 11.0 Light gathering power: 100x more than the eye Field of view: 55mm Tube dimensions: 444 x 90 mm (368mm retracted) Adapters/Threads: 84mm (P=1mm), 60mm (P=0. 75mm), 42mm (P=0.75mm for T-ring) Connections: 60.2mm, 50.8mm, 31.7mm Weight: 3.5 kgSCOPE OF DELIVERY VSD70ss Astrograph Adapter: 60.8mm to 50.2mm 1/4 inch screws (L: 9mm) x 2 Allen keys (3mm, 2mm, 1.5mm, 3/16 inch) Dovetail bar (Vixen standard)

NOTE: This item is a used or returned product. This means: The item may show slight signs of use; some accessories may be missing; the packaging may differ from the original packaging. Please note that refurbished items generally come with a 12-month warranty.

The three-lens design of the EXPLORE SCIENTIFIC ED-Apochromats provides everything an amateur astronomer desires - at a reasonable price. The construction with Hoya FCD001 ED glass has two air spaces and provides a level of correction so superior to the two-lens constructions, that are common in this price class, that you will see the difference immediately. This excellent optical performance teams up with a high precision mechanics - the result is a telescope on a level that is setting a new standard in it´s price class. Astrophotographers will love this telescope - a optional field flattener is available and makes the telescope perfect even for cameras with a large chip format.These very popular EXPLORE SCIENTIFIC Triplet ED APO Refractors we do offer in 3 different product lines:Essential Line: HOYA FCD-1 Glass lens, AL-Tube, 2.0'' Rack & Pinion Focuser with 1:10, 2.0'' Star Diagonal 99% Reflectivity (see Part No. 0112084(AL), 0112106(AL), 0112132(AL)), 0112155(CF + 3''FT)).Professional Line: HOYA FCD-100 Glass lens, AL/CF-Tube, 2.5'' HEXAFOC Focuser with 1:10, 2.0'' Star Diagonal 99% Reflectivity (see Part No. 0112086(AL), 0112108(AL), 0112109(CF), 0112134(AL), 0112135(CF)).High-End Line: OHARA FPL-53 Glass lens, Carbon (CF) Tube, 3.0'' Feather-Touch Focuser with 1:10, 2.0'' Star Diagonal 99% Reflectivity (see Part No. 0112165(CF)).IMPORTANT NOTE: this telescope is supplied without finder or flight case. Compatible finders include the 0620150 EXPLORE SCIENTIFIC ES 8x50 Illuminated Finder Scope, the 0620160 EXPLORE SCIENTIFIC 8x50 90° PolarFinder+Amici-Prism Finder Scope and the 0620170 and 0620180 Explore Scientific 50mm and 60mm Finder-Guidescopes. The 0690420 EXPLORE SCIENTIFIC Flight-Case ED127 ALU Tube and 0690460 EXPLORE SCIENTIFIC Telescope Case ED-APO & AR 127s/152s are both recommended for storage and transportation.SPECIFICATIONS:Aperture: 127mmFocal Length: 952mmFocal Ratio: f/7.5Weight: 7.7kgBackfocus: 165mm beyond 2'' adaptorWHAT'S INCLUDEDOptics with dovetail plate and finder slot2'' Star Diagonal 99% reflectivityDust caps for front-lens and focuser

Please note: This telescope is made to customer specifications. Therefore special conditions apply for this telescope and online ordering is not possible. Please contact our customer service if you would like to order this telescope.Complete H-alpha solar telescope with 300mm aperture and a bandwidth of <0.5 Angstroms. With Feather-Touch focuser, innovative air pressure tuning system and B3400 blocking filter.A extremely large telescope for observing the Sun in H-alpha wavelength, a precisely adjusted refractor with a free aperture of 300mm without central obstruction and 2128mm focal length. The telescope is equipped as standard with a double-stack system, two internal Etalon filters with the innovative air pressure tuning system Pressure-Tuner achieve a bandwidth of <0.5 Angstroms. The Pressure-Tuner system ensures a homogeneous H-alpha image and optimal performance. The Etalons are safely installed inside the telescope. The air pressure tuning system is precisely controlled by an electronic pressure tuner controller.Blocking Filter is the B3400. The B3400 is well suited for imaging the Sun. For visual observation we recommend an additional zenith mirror. The straight extension tube, in which the blocking filter is installed, is equipped as standard with a 2" eyepiece holder and also with an adapter for 1.25". Focusing is done by the legendary Feather-Touch focuser from Starlight-Intruments with 10:1 reduction.FEATURESAperture: 300mm (no central obstruction)Focal length: 2128mmBandwidth: 2 internal Etalons with <0.5 AngstromsTuning: Air-pressure tuning systemElectronic pressure tuner controllerBlocking filter: B3400 with 2" and 1.25" connectionFocuser: Feather-Touch focuser from Starlight-Instruments with 10:1 reductionDovetail bar with Losmandy level for astronomical mountsWeight: ?kgLength: ?cmSCOPE OF DELIVERYLS300THa Double-Stack H-alpha solar telescope2x Pressure-TunerElectronic pressure tuner controllerB3400 blocking filter in straight extension tubeFeather-Touch focuserDovetail bar (Losmandy level)Manual

Giant binocular for observing the starry sky, nature and landscape. Observe the beauty of the starry sky at night and distant objects in nature during the day. Globular star clusters, glowing gas nebulae, the moon with its craters and even planets can be observed wonderfully on a clear night. But also all other distant things in nature and landscape, even ships and airplanes can be seen in detail. With the all-round binoculars of the EXPLORE SCIENTIFIC BT series, you can get up very close. Thanks to the large, light-gathering lenses and the professional coatings on all lens surfaces, these binoculars produce bright and brilliant images even at night and at twilight, providing a special viewing pleasure. The comfortable 45 degree viewing angle allows fatigue-free use, even when the binoculars are tilted upwards towards the zenith.  A large binocular can also be called a double refractor telescope Binoculars such as these can really be described as a double telescope.  In this configuration, the full light gathering power of one single telescope is available to each eye. Experience a whole new dimension of observing as a consequence. Objects are reproduced almost vividly in these binoculars and observing with both eyes is a very relaxing experience. Last but not least, this comfortable way of observation increases the recognition of the finest details (particularly in fainter deep sky targets) and effectively prevents eye fatigue. Extremely robust binoculars with magnesium housing, sealed and filled with nitrogen  The BT series binoculars are designed for tough outdoor use. The IPX6 sealed and nitrogen-filled design effectively prevents fogging of the internal optics even under difficult weather conditions. The very light magnesium housing saves weight and makes it easy to handle. Two EXPLORE SCIENTIFIC 20mm eyepieces of the 62 degree LER series already included. EXPLORE SCIENTIFIC is an established manufacturer of extremely high-quality eyepieces in the astronomy scene. An optical system is only as good as its weakest component. Therefore we have decided to deliver these giant binoculars with a pair of quality eyepieces of the 62 degree LER series. With an apparent field of view of 62 degrees and a focal length of 20mm, the BT-120 binoculars produce a 33x magnification. Thus these wide angle eyepieces offer a very good overview (field of view 1.8 degrees) at moderate magnification. The large interpupillary distance of these LER (long eye relief) eyepieces of 15mm and soft silicone eyecups, which can be turned inside out, also guarantee a comfortable and relaxed view. For astronomy, a flat and sharp image field is advantageous and offers a particularly impressive viewing experience even during the day. Due to the waterproof design and the argon filling, these eyepieces are absolutely durable and easy to clean. Interchangeable eyepieces with 1.25 inch / 31.7mm plug-in diameter Adjust the magnification and field of view to your individual needs and choose from a wide range of available eyepieces. All eyepiece types with a plug-in diameter of 1.25 inch / 31.7mm can be used with the binoculars of the BT series. Especially recommended are EXPLORE SCIENTIFIC eyepieces of the 62 and 82 degree series with focal lengths from 8 to 26mm (see item No. 02188xx and 02196xx). The magnification can be varied from 25x to 75x (focal length binoculars : focal length eyepiece = magnification). The eyepieces are held in the binoculars by a precise brass compression ring clamp and guarantee a tilt free position.  Use of colour and nebula filters for astronomical observations Increase the contrast and visibility of objects and details by screwing the corresponding filters directly into the thread of the eyepiece sleeves. The use of colour and nebula filters must of course always be done in pairs. Suitable are all EXPLORE SCIENTIFIC screw filters with 1.25inch / 31.7mm diameter (see item No. 03102xx)  Comfortable 45 degree view and helical single focus The 45-degree viewing angle allows a relaxed observation position even when the binoculars are tilted strongly. Also the individual interpupillary distance can be adjusted in a range from 54 to 76mm. With the fine helical individual focusing, precise focusing is achieved effortlessly. Extendable dew caps The integrated dew caps can be removed in high humidity and cold conditions. This avoids fogging of the outer objective lenses and effectively shields additional control light coming in from the side. Integrated carrying handle A metal carrying handle located at the center of gravity facilitates transport and ensures a secure hold during tripod assembly. Suitable tripods and tripod connectionWhen using these large binoculars, a sturdy photo tripod with an appropriate load capacity is highly recommended. The connection is made via two 1/4 inch or one 3/8 inch threaded holes (standard photo tripod thread) in the tripod adapter of the binoculars. The ideal solution is to use the optional available EXPLORE SCIENTIFIC U-Mount with field tripod (item No. 0114300). This is specially designed for the large binoculars of the BT series and carries these binoculars absolutely securely. The excellent support mechanism, with adjustable friction in both axes allows easy moving and tracking. The binocular position is kept stable depending on the adjusted friction intensity. Vibrations are reduced to a minimum by the massive construction of the U-Mount and the large stainless steel tripod. Even at high magnification there are no discernable vibrations and this allows the finest details to be observed in a chosen target.FEATURES Large binoculars for observing the starry sky, nature and landscape Observe globular star clusters, glowing gas nebulae, the moon with its craters and even planets Also wild animals, ships and airplanes can be seen in detail Highly light gathering lenses produce a bright and high-contrast image All-round binoculars, but especially suitable in twilight and at night The comfortable 45 degree viewing angle allows fatigue-free use One complete lens telescope with the full light gathering power is available per eye Extremely robust binoculars with magnesium housing, sealed and filled with nitrogen Two EXPLORE SCIENTIFIC 20mm eyepieces of the 62 degree LER series already included 33x magnification and an apparent field of view of 62 degrees, true visible field of 1,8 degreesLarge interpupillary distance of 15mm to the eyepiece lens for comfortable viewing Eyepieces interchangeable and with standardized plug-in diameter of 1.25 inch / 31.7mm The magnification can be adjusted with optional eyepieces from 25x to 75x Precise brass eyepiece compression ring clamps for tilt-free fitColor and nebula filters can be used for astronomical observations Extendable dew caps prevent fogging of the outer objective lenses and stray light Integrated carrying handle facilitates transport and mounting on the tripod Tripod connection via two 1/4 inch or one 3/8 inch threaded holes (standard photo tripod thread) Tripod recommendation: EXPLORE SCIENTIFIC U-mount with field tripod (Art.No. 0114300) Objective type: Air spaced achromatic lens (2 elements/ 1 group) Coating: full multilayer coating on all optical surfaces Aperture, focal length and aperture ratio: 120mm / 660mm / F=5.5 Sealed to IPX6 standard and nitrogen filled: yes / yes Close focus distance: 35 meters Eyepiece mount diameter: 1.25'' / 31.7mm Adjustable interpupillary distance: 54 to 76 mm Helical single focus: yes BAK-4 prism system for a bright and high-contrast imageDimensions and weight of binocular: 654 x 290 x 156mm, 8.3kg Housing colour of binocular:  white What's included Giant binocular with carrying handle (without tripod)Eyepieces ES 20mm 62 degrees LER Series (2pcs)Precisely fitting foam insert for transport Dust covers for objectives and eyepiece sockets Instruction manual

This set, consisting of an excellent 102-mm ED apochromat and the modern iEXOS-100 PMC-Eight GoTo mount, provides first-class sky observations and astrophotography at the highest level. The telescope, with a polystrehl value of 0.97, delivers impressive colour purity, excellent contrast, and razor-sharp images. Additionally, the optical system stands out with its lightweight and compact design and versatile usability. The iEXOS-100 mount, with its Wi-Fi GoTo system and precise PMC-Eight tracking, ensures accurate tracking and easy control via the app. A high-quality 8x50 illuminated finder with upright image and a 62° LER eyepiece with 26 mm focal length and Argon filling are also included in the package. This is the perfect equipment for demanding hobby astronomers and astrophotographers! The Telescope Highly corrected 102mm triplet apochromat (three lenses) with a carbon fibre tube and 2.5'' HEXAFOC precision focuser. Apochromats in the small and medium aperture range are unparalleled: the combination of portability, extremely high image contrast, and sharpness, along with excellent astrophotography capabilities, make these instruments unbeatable. Advances in glass manufacturing have made high-quality apochromats accessible to more buyers. With the new Explore Scientific FCD-100 CF Hex, this development has reached a new peak – the colour purity of this device sets new standards in this price range. The optical design achieves a polystrehl value of 0.97, a mark of excellent correction. This outstanding apochromat is versatile: the fast f/7 focal ratio allows short exposure times in astrophotography, while the high image sharpness and excellent contrast enable both wide-field observations, such as of the North America Nebula or the Andromeda Galaxy, and sharp planetary observations. It is extremely light and compact – the dew shield can be slid in to save space. Modern glass and precise manufacturing make this a top-level observation tool, providing pure enjoyment. This telescope is highly recommended not only for travel but also for quick observations and astrophotography. The high-quality 2.5'' HEXAFOC focuser with 1:10 reduction completes the package – with a large free diameter of 65mm, there is no vignetting, even when using larger camera sensors. The Mount The iEXOS-100 is a high-quality astronomical mount with practical Wi-Fi GoTo functionality and the revolutionary EXPLORE SCIENTIFIC PMC-Eight™ tracking. It makes sky navigation, finding objects, and precise tracking easy. The control is operated via the free ExploreStars app for Windows, Android, and iOS, comfortably through your laptop or tablet. Additionally, the free ASCOM POTH Client from EXPLORE SCIENTIFIC (wired or wireless) is available for download, enabling you to work with virtually any sky software supporting the ASCOM standard. Precise tracking and intuitive control The German equatorial design of the iEXOS-100 allows for precise tracking, enabling observers to keep an object centred in the eyepiece for extended periods. This helps astrophotographers overcome typical long-exposure challenges, such as field rotation and star trails. The unique strength of the PMC-Eight™ system lies in its eight independently operating CPUs, offering excellent responsiveness, efficiency, and extremely accurate tracking to compensate for Earth's rotation. The intuitive user interface of the ExploreStars app makes telescope alignment and night sky navigation easy, providing interesting information about tens of thousands of celestial objects, which are regularly updated. Versatile equipment for easy, universal use Other advantages of the mount include easy-to-use axis clamps, a stepless polar height adjustment, and a polar alignment tunnel for quick alignment with Polaris. A built-in bubble level helps level the tripod. Multiple fluorescent elements on the mount and tripod make it easier to navigate in the dark. The attachment of optics is done via a standard GP dovetail, making the iEXOS-100 a universally applicable mount. TELESCOPE FEATURES Three-element apochromat with two air spaces and a central FCD-100 element Aperture: 102mm Focal length: 714mm Focal ratio: f/7 Tube weight: 3.3 kg, significant weight reduction due to the carbon tube Focus point: 150 mm from the connector MOUNT FEATURES Integrated EXPLORE SCIENTIFIC PMC-Eight™ Wi-Fi GoTo system User-friendly and visually appealing ExploreStars OpenGoto app Wi-Fi control via tablet, laptop, or desktop PC with a minimum 7'' display and Wi-Fi functionality (not included) Compatible operating systems: WIN8.1, WIN10/11, iOS, or Android 4.4 and higher Classic control via directional buttons or virtual joystick for guiding, centring, correcting, and moving via touchscreen Intuitive 2-star and 3-star alignment for GoTo system initialization Polar alignment tunnel for rough polar alignment Standard Vixen-style dovetail for attaching telescope/camera Multiprocessor microcontroller with 8 CPUs Micro-stepper motors and worm gears on both axes Quiet belt drive Mini-USB interface for INDI/ASCOM wired PC connection ST-4-compatible autoguider port INDI and ASCOM drivers available, supports pulse-guiding Ability to create custom firmware and object lists and load them into the PMC-8 GPS compatible / settings dependent on the computer or tablet used Fluorescent elements on the mount and tripod Tripod head weight: 4.0 kg; tripod weight: 2.5 kg Carrying capacity: up to 5 kg total weight SCOPE OF DELIVERY Optical tube 2"-99% star diagonal Two extension sleeves for the focuser Tube rings with dovetail bar and carrying handle Dust caps for the objective and focuser Universal finder shoe 8x50 illuminated finder (upright image) 62° LER eyepiece, 26 mm Argon-filled Explore Scientific iEXOS-100 mount with Open GOTO PMC-8 Stainless steel tripod with built-in bubble level 4x 1.0 kg counterweight Spiral cable for DEC motor 12V battery holder (8 x C batteries not included) Fluorescent elements on the mount and tripod ExploreStars app via free software download User manual

Please note: This telescope is made to customer specifications. Therefore special conditions apply for this telescope and online ordering is not possible. Please contact our customer service if you would like to order this telescope.Complete H-alpha solar telescope with 300mm aperture and a bandwidth of <0.65 Angstroms. With Feather-Touch focuser, innovative air pressure tuning system and B3400 blocking filter.A really giant telescope for observing the Sun in H-alpha wavelength, a precisely adjusted refractor with a free aperture of 300mm without central obstruction and 2128mm focal length. A internal Etalon filter with the innovative air pressure tuning system Pressure-Tuner achieve a bandwidth of <0.65 Angstroms. The Pressure-Tuner system ensures a homogeneous H-alpha image and optimal performance. The Etalon is safely installed inside the telescope. The air pressure tuning system is precisely controlled by an electronic pressure tuner controller.Blocking Filter is the B3400. The B3400 is well suited for imaging the Sun. For visual observation we recommend an additional zenith mirror. The straight extension tube, in which the blocking filter is installed, is equipped as standard with a 2" eyepiece holder and also with an adapter for 1.25". Focusing is done by the legendary Feather-Touch focuser from Starlight-Intruments with 10:1 reduction.FEATURESAperture: 300mm (no central obstruction)Focal length: 2128mmBandwidth: internal Etalon with <0.65 AngstromsTuning: Air-pressure tuning systemElectronic pressure tuner controllerBlocking filter: B3400 with 2" and 1.25" connectionFocuser: Feather-Touch focuser from Starlight-Instruments with 10:1 reductionDovetail bar with Losmandy level for astronomical mountsWeight: ?kgLength: ?cmSCOPE OF DELIVERYLS300THa H-alpha solar telescopePressure-TunerElectronic pressure tuner controllerB3400 blocking filter in straight extension tubeFeather-Touch focuserDovetail bar (Losmandy level)Manual