The Celestron Travel Scope is a quality, easy-to-use medium refractor for use on the go. Its 2.8" objective lens is sufficient for very pleasant use as a spotting scope, and it is combined with a 45° erect image diagonal which is well suited to that purpose. The Travel Scope's also practical as an astronomical scope for lunar, planetary, and wide star field viewing-as a 400mm f/5.7 refractor design, each of these pursuits will be quite pleasurable.