The bottom of the telescope's base is styled like a "Lazy Susan". ![]() To use this system, just turn the large aluminum knobs on either side of the telescope to tighten or loosen the tension until everything balances perfectly. To easily move the AD8 up and down but help it to stay in the desired position, the telescope tension can be adjusted to match the weight of accessories on the tube assembly.The Apertura AD8 tube assembly sits on the base with ease, and then the telescope can be manually moved up, down or to either side. The telescope's base, aka rocker box, is what differentiates a Dobsonian from other Newtonian telescopes.The fan runs on eight (8) AA batteries that are provided by the customer. ![]()
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