This starmaster EL 10" f6 dobsonian scope has a Zambuto mirror s/n SM10-027, with a strehl ratio of 0.986. This great portable scope comes with the owners manual, mirror certifications and a complete Argo Navis computer system, with encoders, data cables and computer cables. A ready to go, push to system. JMI focuser, Rigel Quick finder are included. The wood for the scope is in excellent like new condition, the mirror is in excellent shape, and the shroud is included. Two dust covers. The scope has been keep inside and covered. You do not need a ladder to use this scope, at the highest (zenith) the distance from ground level to the center of the eyepiece is 5' 2" or 62inches.