Blackened lens edges, anti-reflection threads and rubber eyeguards deliver maximum contrast. 100% full field visual inspection on our own flat-field test instruments guarantees the performance of every Tele Vue eyepiece.82°, 13mm 9mm, 7mm and 5mm focal lengths are a compact 7-element design using different exotic materials plus coating processes. Untouched is the full field pinpoint sharpness, but this series benefits from greater contrast. All focal lengths feature 12mm of eye-relief.High technology, parfocal 1 1/4" eyepieces, with 12mm eye relief. Perfect medium/high power eyepieces for the finest telescopes.