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The great thing about a refractor telescope is that it is virtually maintenance free. Since the lenses are held inside a close housing, only the outer lenses need to be clean. Additionally, the enclosed housing of a refractor telescope makes it more durable than other telescopes, improving its portabiltiy. Per inch, a refractor will produce a brighter and sharper image than any other telescope. The major drawback of a refractor telescope is its price. While many small refractors are reasonably priced, large ones can become very expensive as the price increases exponentially.