corrected for most aberrations, providing edge to edge pinpoint stars, and are well suited to use in popular "fast" telescopes. The most expensive Tele Vue eyepiece is the Ethos line, which consists of eight eyepieces known for excellent image quality and ultra-wide 100 degree fields, which can retail for from $500 to $800 or more. At the North East Astronomy Forum 2010, they revealed the Ethos SX, a 3.7mm focal length eyepiece with an even greater 110° apparent field-of-view. In 2011, a new line of eyepieces was introduced called the Delos. These eyepieces are based on the Ethos but have a smaller field of view of 72°. Instead, they boast a comfortable 20mm eye relief. Some Tele Vue eyepieces are over half a foot long and weigh over two pounds. Mounts Tele Vue sells several alt-azimuth mounts and tripods. Accessories Tele Vue also manufactures special nebula filters, Barlow lenses, special image amplifiers known as Powermates, the "Paracorr" coma-corrector for "fast" (f/5 and below) Newtonian telescopes, and the "Dioptrx," a special lens that fits over most Tele Vue eyepieces to correct eyesight astigmatism. References External links TeleVue.com Companies based in Orange County, New York Telescope manufacturers