10mm 17mm 25mm Set Sirius Plossl Eyepieces These 25mm, 17mm and 10mm Orion Sirius Plossl eyepieces are ideal for all types of telescopes Each eyepiece offers a 52deg apparent field of view for clear, sharp images of impressively high contrast Each eyepiece is multi-coated for excellent light transmission Lens edges are blackened to reduce scattering of stray light and maximize contrast Threaded for use with 1.25" eyepiece filters