OPT - The Telescope Authority since 1947. With clients ranging from amateur astronomers to NASA, JPL, and more, OPT is the largest telescope retailer in the world. Oceanside Photo & Telescope, also known as OPT, has the expertise and the drive to help you succeed in your astronomy and astrophotography goals. We carry all equipment from any brand you're looking for to understand and engage with the universe in a tangible way. We are and will continue to be the primary source of information and supplies in the industry. From professional institutions to amateurs just getting started, you'll be treated with the utmost respect and service you deserve. After all, each of us is part of the OPTeam no matter where in the world we reside. We are the Telescope Authority and we want you to be, too.