BRESSER Messier NT203s/800 Optical Tube (Refurbished)

The BRESSER Messier EXOS 100 GOTO Mount is a high-quality German equatorial mount for telescopes and cameras. It automatically locates celestial objects and moves your telescope precisely into position. You can operate the mount using the hand controller with display and keypad, or enjoy wireless control via Wi-Fi from a mobile device, laptop or PC. With a payload capacity of up to 5 kg, the mount is ideal for both visual observing and astrophotography.A stable platform for your telescope or cameraThe Vixen-style dovetail saddle provides a secure attachment for telescopes and cameras. The stainless steel tripod features height-adjustable legs, making it easy to set up at a wide range of observing locations, while the 2 kg counterweight ensures the telescope is properly balanced. A battery compartment for eight C batteries means you can use the mount even when there is no mains power nearby. Alternatively, you can connect a power station (not included) for the power supply.Easy polar alignmentThe built-in bubble level helps you set up the tripod perfectly level, while the integrated polar finder tunnel allows you to roughly align the mount with the north celestial pole. Fine adjustment screws for latitude and azimuth then let you fine-tune the alignment. For even greater accuracy, the optional polar scope (Art. No. 0456103) enables precise polar alignment, helping to improve the accuracy of the GoTo function and tracking.Automatic object location via hand controller or appThe hand controller, with its display and keypad, gives you direct access to the mount's main functions. To get started, simply perform a star alignment using one, two or three stars. Centre the suggested stars in the eyepiece and confirm each position. Once the alignment is complete, you can choose from more than 100,000 stored objects and automatically slew to your chosen target at the touch of a button. The extensive database includes planets, constellations and Messier, NGC, IC, Sh2 and SAO objects. You can also enter and save your own celestial coordinates. Prefer using a smartphone or tablet? Simply download the free app for iOS or Android. Once connected, you can select interesting targets directly from the digital sky map or browse the object catalogue. You can also save your favourites ready for your next observing session.Accurate tracking throughout long observing sessionsThe tracking function automatically keeps your chosen target in the field of view, with sidereal, solar and lunar tracking rates available to suit different observing targets. For manual positioning, you can choose from eight different slew speeds. A quiet belt drive with worm gearing moves both axes smoothly and evenly. The synchronisation function lets you match the mount's position to a known object in the database. For greater accuracy, RA and DEC backlash compensation allows the gear backlash on both axes to be calibrated.Computer control via USB-C and ASCOMThe USB-C interface also lets you connect the hand controller to a computer, allowing you to operate the mount with ASCOM-compatible software such as Stellarium or N.I.N.A.With precise polar alignment, automatic object location, Wi-Fi control and a sturdy design, the mount provides everything you need for visual observing and astrophotography. This compact GoTo mount makes it easy to find and track tens of thousands of celestial objects.Turn your telescope into an easy-to-use GoTo system with the BRESSER Messier EXOS 100 GOTO Mount.FEATURESGerman equatorial mount with GoTo functionPayload capacity up to 5 kgControl via hand controller with display and numeric keysWi-Fi function for control via tablet, notebook or desktop PCHolder for Vixen-style dovetail plates1-, 2- and 3-star alignment for initialisationAccess to over 100,000 stored celestial objectsSynchronisation and RA/DEC backlash compensation for greater accuracy8 slew speeds as well as sidereal, solar and lunar ratesLow-noise belt drive with worm gearPolar finder tunnel for rough alignment with the celestial north polePolar finder scope for precise polar alignment available separately (Art. No. 0456103)Integrated circular bubble level for levelling the tripodUSB-C interface for ASCOM-compatible PC control (e.g. Stellarium, N.I.N.A.)SCOPE OF DELIVERYBRESSER Messier EXOS 100 GOTO MountStainless steel tripod with circular bubble levelHand controller with coiled cableCounterweight (2 kg)Battery compartment for 8 x C batteries (batteries not included)Instruction 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.In the past few years the Bresser Newton telescopes have become the standard workhorse for Deep Sky astrophotography. We now proudly present the second generation of this telescope, the Bresser NT-203s/800 with Hexafoc and a fast parabolic main mirror. The Bresser NT-203s/800 f3.9 will deliver you deeper images due to its - compared to 8" f/5 systems - oversized primary mirror and therefore faster optical system with the same exposure time. The big 85 mm secondary prevents vignetting for optimal illumination The excellent 2.5" Hexafoc focuser also does not cause vignetting due to its large diameter and makes focussing a joy - the smoothness and shifting-free operation sets new standards in this price class. This groundbreaking focuser, tube rings with 44mm universal standard dovetail and camera mounting feature and a high-end finderscope with haircross and laser-engraved scale  leave nothing to desire even for demanding astrophotographers. The NT-203s/800 Hexafoc has a classical tube construction with an aluminium tube. The focuser can be upgraded with a 10:1 reduction (part No. 0625720) without problems. Ready to use with the  HR Coma Corrector (part No. 0510330) which eliminates coma, field-curvature and astigmatism.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.CHARCTERISTICS Optical design: reflector telescopeMirror diameter: 203 mm / focal length: 800 mm / F/3.9Maximum recommended magnification: 406xTelescope for night and solar observing Very high quality Hexafoc focuser with 2.5" free inner diameter Diffraction limited optics with parabolic main mirror 8x50 straight through viewfinder with reticle Optimized finder socket for comfortable use Cradle rings with handle and integrated piggyback camera holder (1/4 thread) Smartphone adapter for celestial navigation included Dovetail plate with stainless steel rail Can be connected to SLR cameras (optional T2 ring required) 50.8mm (2) to 31.7mm (1.25) adapter with integrated T2 thread (T2-adapter ring for your camera is needed) Aperture 203 mm Focal length 800 mm Focal ratio f/3.9 Backfocus fully inward focused: 100 mm 85 mm secondary mirror for optimal illumination Large knobs for primary and secondary mirror adjustment Tube without accessories: 8.7 kg - Tube with all accessories mounted: 11.5 kgSCOPE OF DELIVERYOptical tube 26 mm Super Plössl eyepiece 31,7 mm (1.25") Integrated 31,7 mm and T2 adapter Prism rail with stainless steel clamping surface Adapter for 50.8 mm (2") eyepieces 8x50 optical viewfinder Rotatable star map Aperture solar filter Tube clamp with handle and camera holder Smartphone adapter for celestial navigation Software Stellarium (via download)

NOTE: This item is a used or returned product. This means: The item may show slight signs of use and the packaging may differ from the original packaging. Please note that refurbished items generally come with a 12-month warranty.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 MESSIER NT-150 excells with high rigidity and tack-sharp optics. 150mm aperture enable you to observe bright nebulas in the depth of space. Find the remnants of a gigantic stellar explosion in the year 1054 in the constallation Taurus or scan the glowing bands of the Great Orion Nebula. Detect the famous Whirlpool Galaxy in the Big Dipper or find the Dumpbell-Nebula in the constellation Vulpecula. This telescope is only an optical tube without mount and tripod.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. CHARACTERISTICS Optical design: reflector telescopeMirror diameter: 150 mm / focal length: 1200 mm / F/8Maximum recommended magnification: 300xTelescope for night and solar observation Collects 460x more light than the human eye Pure colour reproduction of the objects Very high quality Hexafoc focuser with 2.5" free inner diameter Optimized finder socket for comfortable use Cradle rings with handle and integrated piggyback camera holder (1/4 thread) Smartphone adapter for sky navigation included Dovetail plate with stainless steel rail T2 thread for DSLR cameras (T2-adapter ring for your camera is needed) 50,8 mm (2) to 31,7 mm (1,25) adapter with integrated T2 thread (T2-adapter ring for your camera is needed)SCOPE OF DELIVERYOptical tube 26 mm Super Plössl eyepiece 31,7 mm (1.25") Integrated 31,7mm and T2 adapter Prism rail with stainless steel clamping surface Adapter for 50.8 mm (2") eyepieces 6x30 optical viewfinder Rotatable star map Aperture solar filter Tube clamp with handle and camera holder Smartphone adapter for celestial navigation Software Stellarium (via download)

NOTE: This item is a used or returned product. This means: The item may show slight signs of use and the packaging may differ from the original packaging. Please note that refurbished items generally come with a 12-month warranty.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 6'' dobsonian is simply a breakthrough. Despite of its low price this telesccope offers a versatility and quality rivaling a lot more expensive telecopes. Not only for beginners - also enthusiastic and experienced amateur astronomers love this high perfomance and compact telescope for traveling and to discover the night sky. The main goal of this telescope is the quick setup and the ease of use. Simply put the Messier 6'' Dobson telescope on a table in your backyard, point the telescope to your target object and you are ready to start your observation. The Messier 6'' Dobson is almost pre-assembled ex factory which means you can start within minutes. With the included standard accessories (LED-finder, 25mm and 9mm Kellner eyepieces and Moonfilter) the telescope is ready for observing. The inbuild compass and circular level speeds up the telescopes orientation. The optical diameter of 150mm (6'') 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. Finding and observing is much easier with that light gathering richfield telescope. Bresser also has equipped these dobsonians with a high quality parabolic main mirror which offers a much better scharpness and contrast than other telescopes with a simple spherical main mirror. In addition, this telescope has a particularly large secondary mirror of 55mm in diametre for ideal illumination of the image field. The 6'' Dobsonian is also equipped with a large 2.0'' focuser, which allows the use of 2.0'' eyepieces with even larger fields of view. Due to the included eyepiece adapter 2'' to 1.25'', all 1.25'' eyepieces can of course be used. The optical tube can easily be moved inside the tube rings in order to find the optimal balance and observing position. This is another virtue of this highly versatile telescope system: Remove the optical tube from the dobsonian telescope mount and use the optics on a equatorial mount - in minutes. 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: 150 mm / focal length: 750 mm / F/5Maximum recommended magnification: 300xtelescope for night and solar observation 2.0'' rack & pinion focuser primary mirror made from optical glass large 55mm secondary mirror  many accessories included - ready to use pre-assembled ex-factory easy to move the tube optics can be attached to other mountings SCOPE OF DELIVERY parabolic Newtonian reflector aperture solar-filter dobsonion telescope mount  LED viewfinder (battery included) 25mm and 9mm Kellner eyepieces (Ø 31.7 mm / 1.25'') moonfilter (Ø 31.7 mm / 1.25'') 1 eyepiece adapter Ø 31.7 to 50.8 mm (Ø 1.25''/2.0'') 2 tube clamps with GP dovetail adapter 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

NOTE: This item is a used or returned product. This means: The item may show slight signs of use and the packaging may differ from the original packaging. Please note that refurbished items generally come with a 12-month warranty.Highly corrected 127 mm air-spaced triplet apochromat (with three lenses) and aluminium tube and a 2.5'' high-precision HEXAFOC focuser. NEW: Now with hybrid viewfinder shoe to accept different viewfinder holders. Apochromats are the ultimate choice in small to medium-sized telescopes: the combination of compactness, transportability, very high image contrast and sharpness together with the possibility to make excellent astrophotos cannot be bested. The advances in glass manufacturing during the last few years have made true apochromats available to more astronomy enthusiasts than ever before. The new Explore Scientific FCD-100 Alu Hex represents another major improvement in this field - the overall correction (colour and spherical) is setting new standards in this price class. The optical design shows a polystrehl value of 0.97 indicating a level of correction that is absolutely top of the line. This excellent apochromat is a very versatile telescope: the fast f-ratio makes short exposure times possible. The high contrast and sharpness of the image provide breathtaking views of large objects like the North America nebula or the Andromeda Galaxy, as well as tack sharp planetary images. The telescope is lightweight and compact - the dew shield slides down the tube to minimize size for transportation. Revolutionary glass and precision manufacturing created a telescope that offers observing joy on the highest level. This does not only qualify this telescope as the ideal travel scope, it is also the perfect choice for fast observations and for astrophotography. The excellent 2,5'' HEXAFOC focuser with 10:1 reduction is perfect for this - the large inner diameter of 65 mm prevents vignetting by the focuser when the telescope is used for astrophotography with large sensors. 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 and Pinion Focusser 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 Focusser 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 Focusser with 1:10, 2.0'' Star Diagonal 99% Reflectivity (see Part No. 0112165(CF)) SPECIFICATIONS Aperture: 127 mm Focal Length: 952 mm Focal ratio: f/7.5 Design: Apochromat with three lenses, two air spaces and FCD-100 glass Weight: 7.7 kg Back focus: 150 mm above 2'' adaptor Hybrid viewfinder shoe to accept different viewfinder holders SCOPE OF DELIVERY Optical tube with retractable dew-shield 2.5'' HEX focuser with 1:10 gear reduction 2'' Star Diagonal 99% reflectivity Tube rings with dovetail plate and handle Dust caps for front-lens and focuser Hybrid viewfinder shoe

Universal 50mm viewfinder and guide telescope with a focal length of 220mmExcellent 8x50 viewfinder telescope with removable eyepiece unit and crosshairs with adjustable red illumination. The precise helical focuser and the 1.25 inch /31.7mm plug-in connection, as well as the T2 camera connection thread (M42x0.75mm), allow the autoguiding required for long time exposure to obtain a point-shaped star image. It can also be used as a mini travel telescope.High quality 8x50 viewfinder telescope with adjustable crosshair illuminationImage sharpness and viewing characteristics lift this viewfinder well above the level of the usual 8x50 viewfinder scopes. The visible image is bright and crisply sharp. Furthermore, this viewfinder has a very large field of view (FOV) of 6.96 degrees. This makes finding and adjusting objects much easier. The existing scale markings (pitch=1 degree) on the crosshairs are a good reference for estimating distances, and the open centre markings also make it easier to centre objects precisely. All lens surfaces are protected against weathering by multi-coating and guarantee a bright viewfinder image due to the high light transmission values. The adjustable red LED illumination unit is powered by two LR41 coin batteries. The main lens and the crosshairs can be focused independently of each other, giving you perfect focus for your eyes.Compact tracking unit for autoguidingOne of the main applications for this telescope is the so-called autoguiding. Here the usually larger photo-taking optics are actively corrected by a smaller guiding telescope with a second tracking camera. This means that the mechanical fluctuations in the tracking accuracy, which are present in all astronomical telescope mounts, are measured by the tracking camera and compensated accordingly. This is necessary in order to obtain a point-shaped star image on the astrophotos during long time exposures and to avoid unwanted star trails. For this purpose, the guiding telescope is inserted into the existing viewfinder shoe of the photo-taking optics and aligned parallel. If the existing viewfinder shoe is not compatible, a suitable viewfinder shoe is also included. With the 1.25 inch / 31,7mm plug connection at the rear end or via T2 thread connection (M42x0,75mm), a tracking camera can be mounted afterwards. This is held securely by a brass ring clamp and 3 clamping screws. Please note the required back focus for your tracking camera. The focal plane (backfocus) is approx. 22mm behind the T2 thread. The sensitive focusing on the guiding star is done by a large knurled wheel of the mechanically precise manufactured helical focuser. For easy reproduction of the point of focus, this has a white millimetre scale from 0 to 28mm, which is attached by laser engraving. After the tracking camera has been connected directly or via computer to the telescope mount and the necessary basic settings have been made, the first astrophotos with long time exposure can be taken.Use as mini travel telescopeThis viewfinder and guide telescope can also be used quite simply as a mini travel telescope. With the optional eyepieces, a magnification of 8x to 40x can be achieved. Nearly all eyepieces with a focal length of 5 to 26mm and 1.25 inch/31.7mm plug connection are suitable. Especially recommended are the EXPLORE SCIENTIFIC eyepieces of the 52 degree (Art. 02195xx) and 62 degree (02196xx) LER series. Note: Only straight view use is possible.Metal viewfinder holder and viewfinder shoeThe mount of this viewfinder and guide telescope is completely made of aluminium and is a stable base. The viewfinder mount is suitable for many common types of telescopes, such as EXPLORE SCIENTIFIC, BRESSER MESSIER etc. If the existing viewfinder shoe is not compatible, a matching viewfinder shoe is also included. This can be attached to the telescopic tube by means of four M5 screws. The bore distances of the viewfinder shoe are 31.7mm on the longitudinal and transverse axis. The six large adjustment screws with non-slip knurling make it easy to align the viewfinder, even with clammy fingers. All adjusting and clamping screws have plastic tips that effectively prevent the viewfinder housing and viewfinder mount from being scratched.FEATURESExcellent 8x50 viewfinder and guiding telescopeCan also be used as mini travel telescopePerfect image sharpness and good viewing comfortFMC Multi-coated lens surfacesLens focal length: 220mmMax. possible camera weight: 550gRemovable eyepiece/cross hair unitCamera connection via 1.25 inch / 31.7mm plug connection or T2 threadT2 thread: M42 x 0,75mmPrecise helical focuser for focusing the visible imageFocuser travel range: 28mmClose focus distance: 3 mLaser engraved millimetre scale from 0 to 28mm on the focuserFocal plane (backfocus) is approx. 22mm behind the T2 threadSeparate focusing of the crosshair at the eyepieceVery large field of view FOV of 6.96 degreesWith adjustable red cross-hair iillumination Scale markings crosshair with 1.0 degree graduationPower supply of illumination unit: coin battery type LR41 (2pcs)Brass ring clamp and 3 clamping screws on the 1.25 inch plug connectionWith optional eyepieces magnifications from 8x to 40x can be achievedSuitable are almost all eyepieces with 1.25 inch/31,7mm shaftMounting of the viewfinder telescope is completely made of aluminiumViewfinder mount with 6 large adjustment screws with knurled head for easy gripFinder shoe suitable for EXPLORE SCIENTIFIC, BRESSER MESSIER etc.Additionally a suitable viewfinder shoe is includedBore distances of the viewfinder shoe are 31.7mm on the longitudinal and transverse axisAdjusting and clamping screws have plastic tipsSCOPE OF DELIVERY8x50 viewfinder/guiding telescopeEyepiece unit with crosshairCrosshair illumination unit incl. batteriesViewfinder holder with viewfinder shoeInstruction manual