Celestron(vixen)CO 100 reflector 100mm diameter at f/10. i like this better than their 4.5" f/8 sold later. rock steady vixen polaris GEM. wooden tripod legs. orion 9v r.a. drive(works great). .965 focuser on scope, orion red dot finder, 30mm and 18mm celestron/vixen eyepieces. optics and construction are superb, maybe this is as good as you can make a 4" reflector. 270.00+shipping.