Orion 8738 7.5mm Sirius Plossl Telescope Eyepiece This 1.25" 7.5mm focal length eyepiece is ideal for all types of telescopes: reflector, refractor, and catadioptrics such as Maksutov-Cassegrains 7.5mm focal length eyepiece is ideal for high-power planetary and lunar observation Offers a 52 apparent field of view for clear, sharp images of impressively high contrast Multi-coated for optimal light transmission and bright views Well suited to double-star viewing when stable seeing conditions permit