Celestron (Baader Planetarium) Binoviewer. 2" aperture. Excellent condition and gives excellent images. A refractor is preferred due to the 60 degree angle of the binoviewer (makes observing the zenith with a SCT neck wringing). The Celestron unit has one big advantage over other binoviewers - it is much easier to adjust the interocular distance. The Celestron slides to a measured interocular distance, others fold like regular binoculars. I have moved up to a Denkmeyer II for that reason and thus this is for sale. $225 includes shipping. PayPal preferred, no surcharge.