This Meade 4 Element Plossl (PL) Eyepiece 07139 is specifically designed for use with ETX 60mm and 70 mm models and yields a power of 19x. Higher magnification are particularly useful in observation of the Moon and planets. Keep in mind, however, that steady atmospheric conditions are particularly important at higher powers. The 4 element wide angle WA18mm eyepiece #07139 yields extremely wide fields of view with either telescope, ideal for scanning star fields or for terrestrial applications. Note that magnifying powers are doubled or tripled, respectively, when an eyepiece is used in conjunction with the #124 2x or #128 3x Barlow lenses.