Cassegrain telescopes are a great all-purpose design, combining the optical advantages of both lenses and mirrors while eliminating their disadvantages. They have superior optics good for lunar, planetary, and terrestrial observation. Some say that the Cassegrain is the best all-purpose telescope for astronomers who like to observe and photograph the stars. Compact, easy to use, durable and practically maintenance free, they are a great choice as they also come at a reasonable price. Shop the Discovery Channelís Store for all the best Cassegrain and astrophotography telescopes.