Rs. A gentle twist on either knob adjusts the amount of friction within the altitude ball-bearing systems. 2100 (include), 6 mm Plossl Eyepiece 1.25" . This negates the wobbly effect / air turbulance caused due to variations in temperature. The bracket is held in place in the mounting shoe by a single large hand-tighten knob that maintains the finder’s collimation, even if the finder is removed between observing sessions. Don’t let its massive size fool … . Rs. . Rs. Rs. Rs. . Download Instruction Manual of 254/1250 Dobsonian Reflector Telescope in .PDF format. This is a LIKE NEW Dobsonian Orion 12 inch SkyQuest XT12i Automated IntelliScope. . You touch the focuser all the time, the focuser is responsible for holding your eyepieces or camera in position and moving them precisely into focus in the first place. This way ultra-precise focus motion is possible for both visual and particularly photographical applications. . It's in "NEW" condition. . The focuser is the most "visible" part of any telescope with the exception of the optics themselves. GSO's rated load capacity for their Crayford focusers is about 3 kgs. Large ribbed clutch knobs are built into the two altitude bearings. . Fully adjustable 3-point flotation system metal cell holds the primary mirror. Why chose a GSO Dobsonian Telescope over other brands ? . 2280, 12 mm Plossl Eyepiece 1.25" . . . In this position tracking is almost impossible in some Dobsonians! The 8 x 50mm finderscope mounts in a quick release bracket that slips into a pre-installed metal mounting shoe nearer the focuser. Orion 10023 SkyQuest XX12i IntelliScope Truss Dobsonian Telescope. . Rs. DOBSONIAN- wooden / with Roller Bearing wooden base / Clutch mount with tension knob. 2100, Mobile Cell Phone Adapter . . A simple teflon friction bearing used by some other manufacturers (also by GSO in the past) offers a rather stiff motion that makes tracking at high magnifications difficult. Powerful 8x50 finderscope, multicoated objective lens. The other thumbscrew on the eyepiece end can be used to adjust the tension of the focuser to achieve a focusing "feel" that you like. The mirror is made of B270 “water white” optical crown glass that is free of internal stress and striae. Suggested Accessories with this Telescope. B270 “water white” optical crown glass, coated with 91% reflectivity aluminum and overcoated with a protective layer of silicon dioxide (quartz) for long life. The telescope can be balanced by moving it up or down a couple of centimetres. . Why chose a GSO Dobsonian Telescope over other brands ? Rs. 110 Messier Object Locator     A4 size front back colour print, Star Dial - Identifying Stars & Constellations, Desiccant Cap - Refillable desiccant cap to protect fine optics, The Moon Map Poster B/W chart unfold to 22"x26", Padded Carry Bag for 12 inch Dobsonian OTA . The thumbscrew on the telescope side can be used to lock the focuser, allowing the use of heavy accessories or cameras without fear or slippage or losing focus. Rs. GSO Dobsonian Telescope with an ADVANCE ROCKER BASE, 2" Crayford focuser - 1:10 micro - reduction from 2" to 1.25", 30 mm 2" Wide Angle ERFLE with 70° field for good overfiew, Eyepiece and Accessory Tray for Eyepieces. . . 3. 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 Crayford style focusing control makes achieving precise focus for visual observations and astrophotography a breeze and you will experience very smooth and precisely controlled focuser motion with zero backlash and zero image shift.Â. Page 1 of 3 - Consensus on "best" 10-12 inch Dobsonian? . The absense of Roller Ball Bearings in other branded Dobsonian Telescopes makes it very difficult to move the telescope on the wooden base. 4800, GSO SuperView 50mm 2" Wide Angle Eyepiece . I love my 6 Dob, mostly because I can easily carry both pieces the short distance from the car or the house to an observing site. . It is a great choice for everyone who is interested in astrophotography. . . The mirror is ground and polished under computer control for guaranteed diffraction limited performance, coated with 91% reflectivity aluminum, and overcoated with a protective layer of silicon dioxide (quartz) for long life. 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. Purchase Dobsonian telescopes today and save! I bought this from Orion in late 2015. The bracket has two hand-adjust collimation screws that work in conjunction with a third spring-loaded post in the bracket. It is far superior to most classic rack-and-pinion focusers: Large load capacity: Up to approx. The focuser is the most "visible" part of any telescope with the exception of the optics themselves. A lightweight 4.7” diameter low-vibration cooling fan is built into the mirror cell to assure faster cool-down times. 2" Precission Micro 10:1 Crayford style focuser". Rs. The focuser has two large thumbscrews on the underside. The features :: 1. . GSO Professional Dobs come with a 2" Wide Angle Super Plossl eyepiece for Wide Angle / Deep Space Observation, GSO's CNC Machined Crayford focuser comes with a 2" 'DUAL SPEED' 1:10 Micro Focusing Capability, GSO Professional Dobs come with Tube Balancing System that allows you to perfectly balance the tube when you add an additional DSLR Camera to the telescope, The new Altitude Metal Ball Bearings and Clutch System provides smooth vertical motion of the optical tube. . Sky-Watcher Flextube 300 SynScan Dobsonian 12-inch Collapsible Computerized GoTo Large Aperture Telescope 4.3 out of 5 stars 19 Sky-Watcher Classic 250 Dobsonian 10-inch Aperature Telescope – Solid-Tube – Simple, Traditional Design – Easy to Use, Perfect for Beginners 3kgs with a firm friction setting, 1:10 dual speed microfocuser for far improved focusing precision, 2" to 1.25" adaptor with compression ring and 2" filter thread, 40mm Plossl Eyepiece 1.25" . 12" DOBSONIAN TELESCOPE - *Used Once - ORION XT12i. We guarantee a diffraction-limited performance, which essentially means that the performance is limited by observing conditions and the laws of physics. . - posted in Reflectors: Is there a consensus on CN regarding the highest optical quality among commercial* 10 to 12 inch Dobsonians? [ Subject To Availability ]. Because the bearings are sealed systems, the elements cannot affect the smoothness of the 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.