The Meade LightBridge 16" f/4.5 Truss-Tube Dobsonian Reflector Telescope offers four times the image brightness as an 8" telescope used at the same magnification and 75% more than a 12" model. In fact, this is the largest LightBridge model. The 16" LightBridge Deluxe Truss-Tube Dobsonian features a superior Meade quality multi-coated, diffraction limited 16" primary mirror, focal length 1829mm (f/4.5). The optics of this style of telescope are only as good as their mounting, which is why Meade engineers gave the LightBridge primary mirror a top of the line, fully adjustable, high strength but lightweight aluminum stress free floating multi-point cell with built in cooling fan. The included battery pack for the fan takes 8 (user supplied) AA. Other features include a high quality, precision machined dual ratio 2" Crayford style focuser with 10:1 micro focus control, and 1.25" adapter so you can use either 1.25" or 2" barrel eyepieces. Includes a 2" diameter Meade Series 4000 26mm QX Wide Angle Eyepiece for stunning wide angle views. The viewfinder is an easy to use red dot unit with four user selectable reticle pattern options and seven step brightness control. Also includes bonus Meade AutoStar Suite Astronomer Edition Software for checking star charts and planet locations.The open truss design of the LightBridge Dobsonians means it is more portable than a solid tube design, and only takes a few moments to set up and break down for travel and transport. The rigid truss frame design ensures a no-compromises view through the telescope. The sturdy laminated finish wooden Dobsonian mount includes premium features such as roller bearings on the azimuth (side to side) axis and large diameter aluminum altitude (vertical axis) bearings with a hand adjustable variable tension brake for smooth and stable movement.