Profile: Televue Optics, Inc. specializes in providing telescopes and eyepieces. Our radians focal length is available in 18mm, 14mm, 12mm, 10mm, 8mm, 6mm, 5mm, 4mm, & 3mm. It has a adjustable eyeguard for blocking ambient light, fully retractable so as not to rob eye-relief. The brands we offer include Nagler™, Panoptic™, Radian™ and Tele Vue™.