The polar-axis telescope has an objective lens, a focal plate, an eyepiece, a zoom optical system, and a zoom optical system driver. The objective lens forms an object image, and the focal plate is arranged on a focal plane of the objective lens. The eyepiece is arranged backward of the focal plate and...http://www.google.fr/patents/US7019896?utm_source=gb-gplus-shareBrevet US7019896 - Polar-axis telescope and equatorial telescope mount including the same
Polar-axis telescope and equatorial telescope mount including the same
