Swarovski binocular owners can now convert their 7X, 8X, 10X, and 15X glasses into telescopes by means of a Doubler: a 2X optical instrument that screws onto one ocular lens and doubles its magnification. The Doubler is only 5 inches long, weighs a few ounces, and will convert a 10X binocular (for example) into a 20X scope. For more information and the name of the nearest dealer, Swarovski at 800-426-3089