Tele Vue products are influenced mostly by seemingly limitless observing equipment vista, such as lunar landing sims, in which producing wide, full-field sharpness and high contrast images were key. While Tele Vue products (especially Tele Vue eyepieces and telescopes) are made for astronomy amateurs, they feature professional quality with an unique design. In fact, each Tele View design is configured to achieve the sharpest full-field, with the number of elements and groups minimized, while yielding the largest possible true fields and eye relief. Some design types for Tele Vue telescopes are scaled, that is, one form is scaled to provide a range of focal lengths. Eye relief, size and weight of TeleView eyepieces "scale" along, but image quality and apparent field remain constant. The performance inherent in every Tele-Vue eyepiece manufactured is verified for you at f/4 - quality assurance available nowhere else.