Tele Vue Optics has been selling astronomy equipment for more than twenty years.
The company's founder, Al Nagler, worked for NASA designing lunar landing simulators. Al wanted his own observing equipment to deliver that seemingly limitless vista created for the astronauts.
Al's "Nagler" series heralded its own revolution in eyepieces. It had an 82° apparent field, and 10 times the field sharpness of any previous eyepiece.