The Tele Vue Delos 3.5 mm 72deg. Eyepiece is a compact durable wide field telescope eyepiece designed for lunar and planetary observations. Wide pupil diameter and adjustable eye relief make this eyepiece ideal for comfortable long duration observation sessions. Contrast is enhanced by an adjustable height rubber eyecup that prevents stray light from degrading the image transmitted through the ocular. Anti reflection multicoated optics ensures bright, high contrast, color faithful images from edge to edge.