The Sky-Watcher Long Eye Relief Plossl Eyepieces are a modified 7-element fully coated Plossl with a 58° apparent field of view. With 20mm of eye relief the superb field edge correction and high contrast of the Plossl design is comfortably usable even with eyeglasses. All lenses come with a multi-layered anti-reflection coating and blackened edges to maximise light transmission Expertly finished in anodized aluminium, it features knurled rubber grips and is threaded for use with standard filters.