This way ultra-precise focus motion is possible for both visual and particularly photographical applications. 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. The focuser is the most "visible" part of any telescope with the exception of the optics themselves. The battery-operated fan is powered by a battery pack that uses eight user-supplied AA batteries and plugs into a jack on the mirror cell frame. B270 “water white” optical crown glass, coated with 91% reflectivity aluminum and overcoated with a protective layer of silicon dioxide (quartz) for long life.įully adjustable diagonal holder mounted on a low-diffraction four-vane thin spring steel spider.įully multicoated Premium plossl eyepiece1.25"Ī lightweight 4.7” diameter low-vibration cooling fan is built into the mirror cell to assure faster cool-down times. Large hand-tighten color-coded push-pull collimation and collimation lock knobs make it easy to collimate the primary mirror with no tools required.Ĥ7mm m.a. ![]() The open frame of the cell allows the mirror to cool down to ambient temperatures quickly, so you can start observing sooner. B270 “water white” optical crown glass, coated with 91% reflectivity aluminum and overcoated with a protective layer of silicon dioxide (quartz) for long life.įully adjustable 3-point flotation system metal cell holds the primary mirror. 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.Ħ2.5mm m.a. 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. B270 glass is equivalent to BK7 in performance and optical quality. ![]() The mirror is made of B270 “water white” optical crown glass that is free of internal stress and striae. We guarantee a diffraction-limited performance, which essentially means that the performance is limited by observing conditions and the laws of physics.Ĩ” (203mm) diameter, 1200mm focal length, f/5.9 focal ratio with surface accuracy of 1/12 wave. It is our firm opinion that GSO offers better mirrors in this price range. GSO produces parabolic primary mirrors of very high quality. The heart of any telescope is its optics. ![]() This makes collimation faster than the traditional three- or six-screw collimation methods used with conventional finder brackets. The bracket has two hand-adjust collimation screws that work in conjunction with a third spring-loaded post in the bracket. 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. The 8 x 50mm finderscope mounts in a quick release bracket that slips into a pre-installed metal mounting shoe nearer the focuser. This little telescope will show many objects in direct vision for easy location. Powerful 8x50 finderscope, multicoated objective lens. Physical Copies of the manual will not be given. Please Download INSTRUCTION MANUAL in PDF from the link provided below. This telescope is also very transportable and easy to use - an ideal telescope for beginner! What's In The BoxĢ" Crayford focuser - reduction from 2" to 1.25"Įyepiece and Accessory Tray for EyepiecesĬollimation Tool Plus a host of Free Items 8" Aperture are perfect for Moon and Planets but also for Nebular objects and Galaxies. This classic Dobsonian telescope is one of our best-sellers. ![]() The optical and mechanical quality are without any compromises. This Classic 8-inch dobsonian from Guan Sheng Optics offers high optical performance at a low price.
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