Star Trackers s StarSync Tracker starsynctrackers.com * Starting at $239.95 The StarSync Tracker is essentially a barn-door mount, constructed of aluminum and stainless steel weighing 3¾ lbs. A bare-bones version is aligned by sighting along the hinge; a green-laser-pointer accessory, available to provide more accurate polar alignment, might be a problem at public dark-sky star parties. It's powered with 12 volts DC (also an additional accessory) and can track for up to 2½ hours before its drive mechanism has to be reset. The unit has a built-in alt-azimuth camera swivel mount with a ¼-20 tripod thread. Sightron Nano Tracker omegon.eu * Starting at $308 This compact drive is about as big as your fist and weighs less than 1 lb. but can bear a load of about 4½ lbs. It's powered with three AA batteries and attaches to standard ¼-20 tripod threads. The unit is aligned using a simple peep-sight hole. The Nano Tracker can be operated in both Northern and Southern Hemispheres and includes drive rates of sidereal, 0.5× sidereal, and 50× sidereal to aid in slewing to targets. An optional ball head is available at additional cost. iOptron SkyTracker Pro ioptron.com * Starting at $299 This new and improved redesign of the SkyTracker seen on page 69 sports a much more refined alt-azimuth adjustment for dialing in polar alignment, and it uses the same (excellent) polar-alignment scope that also works with the iOptron Polar Scope app. It's powered with an internal rechargeable battery that can drive the mount for up to 24 hours and recharges in 5 hours through a micro USB port. Its polar-alignment scope has adjustable brightness levels, and the unit includes both ¼-20 and 3/8-inch threaded attachments. Like its predecessor, the SkyTracker Pro includes four tracking rates and can be used in both Hemispheres. It also features a 180× slewing mode in RA to help frame your subject. The SkyTracker Pro weighs 2.53 lbs. with a maximum payload capacity of 6.6 lbs. 68 M A Y 2 0 1 7 * SK Y & TELESCOPEhttp://www.starsynctrackers.com http://www.omegon.eu http://www.ioptron.com