Orion 8250 7.2-21.5mm Zoom! Telescope Eyepiece Zoom telescope eyepiece with 7.2mm to 21.5mm focal length range provides a variety of viewing magnifications in a single eyepiece Provides a 40-degree field of view at 21.5mm, and a wide 60-degree field of view at 7.2mm Comfortable 15mm eye relief Fully multi-coated 7-element optics for clear, crisp images Threaded for use with 1.25" Orion eyepiece filters