EXPLORE SCIENTIFIC 92° LER Eyepiece 17mm (Refurbished)

Highly corrected 102mm air-spaced triplet apochromat (with three lenses) and carbon fiber tube and a 2.5" high-precision HEXAFOC focuser.   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 CF Hex represents another major improvement in this field - the overall correction (color 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 65mm 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&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 Glas 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))SPECIFICATIONSAperture: 102mmFocal Length: 714mmFocal ratio: f/7.0Design: Apochromat with three lenses, two air spaces and FCD-100 glassWeigth: 3,3kg , lightweight due to carbon fiber tubeBackfocus: 150mm above 2" adaptorDesign: Apochromat with three lenses, two air spaces and FCD-100 glassSCOPE OF DELIVERYOptical tube with retractable dew-shield2.5" HEX focuser with 1:10 gear reduction  2" Star Diagonal 99% reflectivityTube rings with dovetail plate and handleExtension tubes for focusser (2pcs)Dust caps for front-lens and focuserUniversal finder slot 

If a observing session is a relaxing and joyful experience is heavily dependend on the choice of eyepieces. People wearing glasses very often have the problem to see the entire field of view when they are using eyepieces with large apparent fields. This problem is now history. The new 62°- LER eyepieces by Explore Scientific do not only offer excellent image sharpness and high resolution and contrast over the full field of view - you can see that full field without problems even with glasses on. Fatigue due to tense head positioning and strained viewing simply does not happen because of the excellent viewing comfort these eyepieces provide even to observers wearing glasses. Enjoy the unique combination of excellent image sharpness out to the edge of the field even for fast optics, superior contrast and unmatched viewing comfort. Eyepieces with perfect combinations of various modern glass substrates and highest standards in manufacturing, quality control and service are a tradition at Explore Scientific - the outstanding resolution and sharpness to the very edge.These eyepieces are the choice for observers wearing glasses - with excellent performance and durability. The rubber inlet and the foldable eyecups make handling and using in the field easy. The patentet EMD"-coating produces high contrast images and prevents reflexes and ghosting. The argon purging effectively prevents internal fogging, and you don´t have to deal with dirt, fungus or cleansing fluids getting between the lenses. The eyepieces are sealed - this makes sure you will be able to enjoy these eyepieces for many years to come.Eye relief: 15mm

With the Maksutov Newton MN-152 David H. Levy Comet Hunter and the EXOS-2 PMC-Eight GoTo mount by EXPLORE SCIENTIFIC, you get an excellent telescope set specifically designed for wide-field observations and astrophotography. The highly corrected Maksutov-Newton offers much sharper images than classic Newtonian telescopes, making it ideal for visual observations and digital astrophotography. The outstanding mount with a precise GoTo system and the intuitive ExploreStars app ensures accurate tracking and easy navigation of the night sky. This is the perfect equipment for ambitious amateur astronomers who value the highest image quality and easy operation! The Telescope The Maksutov Newton MN-152 David H. Levy Comet Hunter is a highly corrected optical system for wide-field observation and astrophotography, developed in collaboration with the famous "comet hunter" David H. Levy. The Maksutov-Newton system, by design, has advantages and disadvantages compared to the classic Newtonian telescope. Aside from the higher cost, its drawback is the heavier weight due to the thick meniscus lens at the front opening. The main advantage of the Maksutov-Newton over the classic Newtonian is its edge sharpness. Newtonian telescopes are only sharp in the centre of the image, while off-centre they show the prominent coma, which distorts the star point into a tail, like a small comet, causing a loss of sharpness and contrast. The Maksutov-Newton significantly reduces this error, making it sharper for most purposes, both for visual observation and photography with digital SLR cameras. The Maksutov-Newton is therefore an almost ideal all-round telescope, providing sharp images across the field without additional correctors. The Mount The EXPLORE SCIENTIFIC EXOS-2 PMC-Eight GoTo mount is equipped with a modern and very precise GoTo control system. It consists of a robust Wi-Fi controller unit that provides all necessary interfaces. The NEMA-11 stepper motors are directly connected to this unit by cable, and an ST-4 compatible autoguider port is also included. Additionally, the system supports microstep operation for precise tracking. Intuitive control via app and graphical star map The dedicated ExploreStars app for the PMC-Eight system features an intuitive user interface with a well-designed graphical star map. All current alignment stars for GoTo system initialisation and all database objects are displayed as a star map with additional text information. All of these objects can be easily viewed and selected. Powerful controller unit with Open GoTo for customisation The heart of the controller unit is a completely autonomous 2-channel multiprocessor with 8 CPUs and a Wi-Fi Ethernet 10/100 adapter with IP functionality. This allows remote operation via browser, ASCOM, app, or serial connection. With Open GoTo, you can also write your own firmware and load it into the controller unit, allowing for custom adjustments to the device’s functionality and the creation of custom object lists. Polar finder included The included and pre-installed polar finderscope allows for quick and precise polar alignment, enabling long exposure times without unwanted star trails. The integrated LED illumination unit enhances the user experience with the polar finderscope. FEATURES TELESCOPE Aperture: 152 mm / Focal length: 731 mm / F-ratio: 4.8 Total length with dew shield: 825 mm Eyepiece holder diameter: 2" and 1.25" Universal 44-mm dovetail plate with stainless steel rail (compatible with LXD75/Great Polaris/EQ5) Total length including dew shield: 825 mm Total weight including tube rings, handle, dew shield, and finderscope: 7.9 kg FEATURES MOUNT Powerful PMC-8 Open GoTo system User-friendly and graphically appealing ExploreStars OpenGoto app Wi-Fi control via tablet, notebook, or desktop PC with at least 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 direction buttons or joystick for guiding, centring, correcting, and moving via touchscreen Intuitive 2-star and 3-star alignment for GoTo system initialisation Multiprocessor microcontroller with 8 CPUs Micro-stepper NEMA-11 motors High-precision and quiet belt drive ST-4 compatible autoguider port ASCOM drivers available, also supports pulse guiding Option to create custom firmware and object lists and upload them to the PMC-8 GPS compatible / Settings depend on the computer or tablet in use Power supply via 12V DC, with maximum current draw of 1.6 amps under full load SCOPE OF DELIVERY Carbon fibre optical tube (CF) 2" focuser with 10:1 reduction Carbon dew shield with dust cover Telescope rings with dovetail 52° LER 30 mm eyepiece 8x50 illuminated finderscope EXOS2-GT mount with OpenGoTo PMC-8 Stainless steel tripod with built-in bubble level 2 x 4.5 kg counterweights Polar finderscope with illumination unit 12V / 2A power supply ExploreStars app via software download Instruction manual