Assertion: eyepiece's lens | /r/CapableOf | fit over most tele vue eyepieces
Facets:
value: to correct eyesight astigmatism
type: PURPOSE
Source sentences:
text: 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.