0.965"/24.5mm Telescope Eyepiece Set H20mm SR4mm SR4mm Multi-coated. ApplicationSupport all types of telescopes, reflector, refractor, to observe the star nebula cloudy cluster, moon, planet and deep sky, perfect for astronomy exploration. 35 Degree Field of ViewWide viewing field with extra sharpness. Fully Coatedhigh quality optical glass for maximum brightness. Suitable for 0.965"/24.5mm telescope eyepiece filters. Specification: MaterialOptical Glass + Metal Focal Length20 mm(0.79 inch)/4mm(0.15 inch)/12.5 mm(0.49 inch) Eyepiece Port24.5 mm/0.965 inch H20mm Eyepiece Size4.7*2.8 cm/1.85*1.10 inch SR4mm Eyepiece Size3.7*2.8 cm/1.46*1.10 inch H12.5mm Eyepiece Size4*2.7 cm/1.57*1.06 inch Package Includes: 3x Telescope Eyepiece Set