SkyWatcher 8 Collapsible Dob Brand New Includes Limited Two Year Warranty The SkyWatcher 8-Inch Collapsible Dob Telescope features a large-aperture, short focal-length, Newtonian reflector. Sky-Watcher's optical tube design utilizes their proprietary truss support system. That system allows the optical tube's front and back tubes to collapse together, aligning on the truss support rods, and locking down for secure transport. An 8x50mm right angle optical viewfinder provides both magnification and light gathering to help narrow your search for those elusive fuzzies while star-hopping. Some prominent deep-space objects seen well in an 8 SW DOB are the Lagoon M8 , Trifid M20 , and Swan M17 nebulae, the globular star clusters M13 and M92 in Hercules, the Great Orion Nebula M42 and our local galaxy group companion, the Andromeda Galaxy M31 , and many more. The standard, backlash-free, 2 Crayford Focuser insures ultra smooth focusing adjustments. 8-Inch Collapsible Dob Features 8 Inch Aperture 203mm Focal Length 1200mm, f/6 Focal Ratio 8 50 Finderscope Truss-support System Dobsonian Solid Rocker-mount 2 Single-Speed Crayford Focuser Teflon Bearings Tension Clutch Collapsible Tube Design Specifications .boldTbl{ font-weight bold;} .specs td, table.specs th {padding 4px 10px;} Optical Design Newtonian Reflector Aperture mm 200mm 8 in Focal Length mm 1200 mm 47 in Focal Ratio f/6 Eyepiece Barrel Diameter 1.25 Maximum Useful Magnification 472x Lowest Useful Magnification 29x Limiting Stellar Magnitude 14 Finderscope 8x50 Finderscope RA Viewfinder Mount Type Dobsonian Focuser Size 2 Focuser Speed Single Speed Eyepieces 4-element Plossl Eyepieces 25mm Power 48x Eyepieces 10mm Power 120x Optical Tube Weight