The modified achromat series eyepieces offer an increased performance standard in a very affordable package. Designed for telescopes with mid-range to long f/ratio, these oculars have features usually found only in more expensive designs. There are three eyepieces in a set, each designed to enhance your viewing experience. These Super Eyepieces incorporate fold-down rubber eyecups, fully coated optics, and outstanding field correction. The focal length available in 20mm, 10mm, 3.6mm.