The Tele Vue Delos 3.5mm 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.