The 8mm Tele Vue Plossl eyepiece is made with high-index glass and is fully multi-coated for superb light transmission and image contrast. Diffraction limited “on-axis” performance is a given with all Tele Vue Plossl eyepieces. Using more expensive high-index glasses to reduce astigmatism and lateral color at the field’s edge, Tele Vue Plössl eyepieces deliver sharper images than any other brand of 4 or 5-element “Plossl” or Orthoscopic design. Tele Vue Plössl eyepieces also feature full multi-coatings for greatest light transmission and contrast. Blackened lens edges and internal anti-reflection threads tweak the last bit of contrast for maximum image detail.