These are the telescopes to buy if you wish to view the universe both visually and photographically. SVX series Apochromatic Telescopes use objectives that are hand figured in our optical shop in Auburn California. After mapping optical surfaces, we make fine corrections by hand and machine to bring the optical accuracy as high as possible. While our former models without the X designation were all excellent coming in at .95 Strehl or higher, these have an even higher rating. SVX series telescopes are individual hand figured to a rating of .98 or .99 or higher! These are the most accurate lenses we have ever offered. All Stellarvue Premier (X) Series refractors are for the discriminating astronomer who can recognize the best when they see it. A Zygo interferometric test report is included documenting the accuracy of your objective!