The OVL high-performance zoom eyepiece of the highest quality for your telescope provides a flat field of view and sharp, clear and distortion-free images. It provides stepless focal length adjustment from 7.2mm to 21.5mm and an apparent field of view from 60° to 40°. For greater convenience, the focal lengths of 7.2mm, 10mm, 13.5mm and 21.5mm are engraved on the case. The eyepiece can be adjusted extremely smoothly and is a pleasure to observe. The eye relief is 15mm. The construction includes 7 lenses in 4 separate groups. This exotic eyepiece model features a generously sized eye lens and soft, adjustable eyecup for comfortable viewing. It is fully broadband coated, the lens edges have been blackened and it is equipped with internal apertures and is parfocal. The housing is high-quality, high-gloss black anodized and equipped with ribbed rubber grip rings. The eyepiece sleeve is equipped with a thread for standard 1.25″ filters to accommodate filters. Scope of delivery: 7.2-21.5mm zoom eyepiece with 1.25″ sleeve Dust protection caps! Power supply and batteries are not included in the scope of delivery!