กล้องดูดาวสะท้อน GSO 12" Pro Dobsonian Telescope พร้อม Crayford Focuser แบบ 2" GS980 รุ่นปรับปรุง ราคาเดิม!
โปรดทราบ: กล้องดูดาว GSO รุ่นนี้ได้เพิ่มระบบ Tube Balance System และปรับปรุงระบบยึดตำแหน่งโดยการแทนที่ Spring Tension System เดิมด้วย Altitude Clutch เพื่อเสถีรภาพที่ดีขึ้น ซึ่งจะมีลักษณะใกล้เคียงกับภาพด้านล่าง (อาจแตกต่างในรายละเอียดปลีกย่อย เช่นสีของฐาน ลูกบิด เป็นต้น) NEW! Tube Balance System and Altitude Clutch with sealed altitude ball bearing: GSO เป็นผู้ผลิตกล้องดูดาวและอุปกรณ์ต่างๆให้กับแบรนด์ยี่ห้อดังทั้งหลาย รวมถึง Big 3 อย่าง Celestron, Meade Instruments, Orion และยังผลิตให้กับอีกหลายยี่ห้อทั่วโลก เช่น Zhumell (สหรัฐฯ), Apertura (สหรัฐฯ), TPO (สหรัฐฯ), Teleskop Service (เยอรมัน), Sky Optic (ฝรั่งเศส), Antares (แคนาดา), Astronz (นิวซีแลนด์) เป็นต้น (และมีอีกกว่า 10 ยี่ห้อที่ขายอุปกรณ์ GSO ภายใต้ยี่ห้อตัวเอง) GSO มีชื่อเสียงทางด้าน QC สูง มี defect ต่ำ Review ต่างประเทศให้คะแนนทางด้าน QC ของฐานการผลิต GSO ในไต้หวันสูงกว่าผู้ผลิตกล้องดูดาอื่นที่มักมีฐานผลิตในจีนแผ่นดินใหญ่ GSO จึงได้คุณภาพที่ใกล้เคียงญี่ปุ่นมากกว่า และถือเป็นผู้ผลิตรายใหญ่ 1 ใน 5 ของ Asia Pacific ซึ่งเป็นแหล่งผลิตกล้องดูดาวแทบทั้งหมดที่ไปสู่ทั่วโลก ลองใช้ดูสักครั้ง - คุณจะไม่ผิดหวัง! วิธีประกอบกล้องดูดาว GSO GS880 Dobsonian (วิธีเดียวกันกับกล้องดูดาวในวีดีโอซึ่งผลิตโดย GSO เช่นกัน):The GSO GS980 Dobsonian is a user-friendly telescope for the serious amateur who wants serious deep-sky light-gathering. It shows you faint deep space objects that are simply invisible in smaller scopes. With a visual limiting magnitude of 15.1, the GSO GS980 is ideal for observing faint nebulas, galaxies, and star clusters from a dark sky site – all the faint fuzzies outside the solar system that fascinate us. At Thai Excite, a Dobsonian is no dead-end-street. We offer all possible optional equipment like tripods and mounts, dozens of eyepieces, and even equipment for astro photography. The GSO GS980 houses a big 305mm (12") parabolic mirror with 44% more light grasp than a 10" mirror for brighter, more detailed views of night sky curiosities. GSO mirrors are extremely well figured and are guaranteed to be difraction limited - for sharp high contrast images of nebulas, galaxies, and star clusters. Planetary images are also sharp and crisp. The center-spotted mirror is ground with computer-controlled accuracy, multicoated with aluminum, and then overcoated with quartz for long life. Under dark skies, the 12" aperture of the GS980 provides sharp and bright high contrast images of nebulas, galaxies, and star clusters. Galaxies will reveal their spiral structure. Planetary nebulae will display splendid detail where a smaller telescope will hardly show anything. Lunar and planetary images are also sharp and crisp, but the included neutral density (Moon) filter would certainly be called for to cut down on the incredible solar system brightness provided by this 12" mirror – almost 1900 times that of your eye. The diffraction limited quality optics from GSO will at the same time offer razor sharp images even at high magnifications. The visibility of details is not limited by the telescope, but rather by observing conditions! As with any serious telescope, the performance of the 12" GS980 on faint objects will be improved by a dark sky observing site. The streamlined Dobsonian telescope base offers unflinching stability yet easy portability. While the telescope may appear bulky, it is actually quite managable to move around your backyard or to a dark sky site, since it can be separated into two main sections: the optical tube (1450mm x365mm), and the Dobsonian base (640mm x 635mm). GS980 weights 73 lbs (33kg) fully assembled. Putting the 2 parts back takes just a moment, with no tools needed. Simply lift the optical tube, rest its circular altitude bearings in the semi-circular cutouts in the sides of the rocker box, put in an eyepiece, and you're ready to observe. Simply-made, but with precision Newtonian optics, this GS980 12" Dobsonian reflector will reward you with bright deep space and solar system views and years of trouble-free observing enjoyment. GSO GS980 Optical Tube Assembly (OTA) Features Primary mirror: 12" (305mm) diameter, 1520mm focal length, f/5 focal ratio. Parabolic mirror. The mirror is made of B270 “water white" optical crown glass that is free of internal stress and striae. B270 glass is equivalent to BK7 in performance and optical quality. The thermal stability of B270 glass is generally better than the soda lime float glass used for the mirrors of most reflectors in this reasonable price range. The mirror is ground and polished under computer control for guaranteed diffraction limited performance, coated with 94% reflectivity aluminum, and overcoated with a protective layer of silicon dioxide (quartz) for long life. Primary mirror cell: A computer-optimized 9 point main mirror cell completely machined from metal.. The open frame of the cell allows the mirror to cool down to ambient temperatures quickly, so you can start observing sooner. Large hand-tighten color-coded push-pull collimation and collimation lock knobs make it easy to collimate the primary mirror with no tools required.
Diagonal mirror: 63mm m.a. B270 “water white" optical crown glass, coated with 94% reflectivity aluminum and overcoated with a protective layer of silicon dioxide (quartz) for long life. Diagonal mirror support: Fully adjustable diagonal holder mounted on a low-diffraction four-vane thin spring steel spider. The GSO GS980 also allows you to calibrate your mirrors to obtain the highest quality images that the telescope mirror is capable of. Use a philips-head (cross-head) screw driver to keep both primary and secondary mirrors in alignment. Such screws makes it easy to get the best out of your GSO GS980 telescope which has great reputation for its best-in-class mirrors. Focuser: Dual-speed 2" Crayford type, with 1.25" eyepiece adapter. The machined aluminum focuser has dual coarse focusing knobs for smooth and precise image control with either hand. There is a separate 10:1 reduction ratio microfocus knob for ultra-fine focusing at high magnifications. The ribbed focus knobs are easy to operate, even while wearing gloves or mittens in cold weather. A 35mm extension tube for eyepiece use is standard equipment. The extension tube, and both the 2" eyepiece holder and the 1.25" adapter use non-marring soft brass compression rings to hold eyepieces in place, rather than simple thumbscrews that can scratch your eyepiece barrels. Two eyepieces: One is a fully multicoated 2" 30mm (50x) 68° field SuperView eyepiece with a wide 1.6° actual field of view that's almost three and a half times the diameter of the full Moon. The second is a fully multicoated high power 1.25" 9mm (167x) 52° field Plössl. Eyepiece rack: A standard equipment eyepiece rack attaches to the side of the scope's altazimuth base. It has cutouts to hold one 2" eyepiece and three 1.25" eyepieces. Finderscope: 8 x 50mm straight through fully-multicoated dark crosshair achromatic design. The finder has a long and comfortable 13mm eye relief. It focuses by loosening the trim ring behind the objective lens cell, screwing the lens cell in or out to focus, and tightening the trim ring to lock in the correct focus. Finderscope bracket: The 8 x 50mm finderscope mounts in a quick release bracket that slips into a pre-installed metal mounting shoe beside the focuser. The bracket is held in place in the mounting shoe by a single large hand-tighten chrome-plated knob that maintains the finder's collimation, even if the finder is removed between observing sessions.. The bracket has two hand-adjust collimation screws that work in conjunction with a third spring-loaded post in the bracket. This makes collimation faster than the traditional three- or six-screw collimation methods used with conventional finder brackets. GSO GS980 Mount Features The GSO G980 is easy to use - just point, release and observe. Vertical adjustment is aided by the tension control system described below. Here, you can adjust for the stiffness in this axis and even lock it. The GSO GS980 Dobsonian telescope comes equipped with a smooth 2" crayford focuser with a 1.25" adapter, thus allows for use of both 1.25" and 2" accessories. It has a removable telescope eyepiece rack, a altitude clutch to hold scope in position, two telescope eyepieces, a moon filter, and a comfortable 8x50 correct-image finder scope. With accessories like these included, you're ready for night after night of family stargazing fun right out of the box! Altitude ball bearings: Horizontal and vertical adjustment of the GSO GS980 Dobsonian telescope is very easy. Instead of the usual large circular trunnion bearings riding on a few Teflon pads in the semi-circular cutouts in the altazimuth base, this GSO 12" GS980 Dob uses innovative sealed metal ball-bearing systems to provide smooth vertical motion of the optical tube. The aluminum bearing housings fit snugly into cutouts in the sides of the altazimuth base. Because the bearings are sealed systems, the elements cannot affect the smoothness of the GS980's vertical motion, as it can when dust and grit invariably get trapped between the exposed trunnions and Teflon pads of conventional Dobsonians and scores the surfaces. The vertical motion of the GS980 tube is consistently ball-bearing smooth. And the sealed ball-bearings will not have to be replaced regularly, as is the case with the Teflon pads of many Dobsonians when wind-borne grit degrades the Teflon/trunnion interface. Altitude clutch: Large ribbed clutch knobs are built into the two altitude bearings. A gentle twist on either knob adjusts the amount of friction within the altitude ball-bearing systems. This allows you to keep the focuser from rising or sinking when changing between eyepieces of considerably different weights, as for instance when switching between 1.25" and 2" eyepieces. Tube balance system: The altitude bearings of the GSO GS980 are bolted to slotted plates attached to the optical tube. This allows the optical tube to be moved fore and aft in the slots to balance the optical tube. The altitude bearings have been positioned at the factory to balance a wide range of eyepiece weights with the occasional help of the altitude clutch knobs. However, if you have mostly heavy eyepieces in your observing kit, you may want to adjust the tube balance to compensate for the tube's resulting nose-heavy balance. By tilting the optical tube down until it is parallel with the ground, and loosening the altitude clutch knobs, you can observe whether the eyepiece end of the tube rises or falls when you let the tube go with your heaviest eyepiece installed. You can then loosen the balance lock screws on the altitude bearings and slide the altitude bearings back or forth in the slotted plates as needed to balance the optical tube properly. An engraved scale on each plate makes it easy to move both altitude bearings the same amount. Tighten the balance lock screws and your tube is balanced for the majority of your eyepieces. Balancing the tube needs only be done once if you discover that your optical tube is consistently nose- or tail-heavy. The altitude clutch knobs will take care of most occasional minor imbalance situations when changing between eyepieces of different weights. Altazimuth base (rocker box): The altazimuth base that the optical tube rides in is crafted of strong, lightweight, and water-resistant laminated particle board. The base is shipped disassembled, but can be put together in about a half an hour using only a Philips-head screwdriver and the supplied hardware and hex-head wrench. The GS980 moves in azimuth on dozens of steel roller bearings riding between two metal plates. Push the scope lightly in any direction and it starts moving at the touch of a finger – smoothly and with no fuss. Stop pushing and it settles down immediately, with no shudder or vibration to mar your viewing experience. A carrying handle is provided to make carrying the rocker box easier. SPECIFICATIONS
GSO is a leader in optical telescopes and accessories and their products have been sold for years by the "Big Three" (Meade, Celestron and Orion) under their own brand names. GSO telescopes and accessories are also sold under different names world-wide; Zhumell (USA), Apertura (USA), TPO (USA), Teleskop Service (Germany), Sky Optic (France), Antares (Canada), Astronz (New Zealand), and more than a dozen more brands too many to name. GSO is known for their high consistency in quality control, low defect rate, and their Taiwanese-based manufacturing scores closer to Japan in quality than other telescope manufacturers which mostly manfacture thier scopes in Mainland China. Give these telescopes a try - you will not be disappointed! |
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